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300 rep Core Workout

20 min
 · 
9 exercises

Go through it all at once or break it down into rounds - your choice

Bicycles exercise illustration
Bicycles
1 sets
50 reps
0:30 rest
Weighted Russian Twists exercise illustration
Weighted Russian Twists
1 sets
50 reps
0:30 rest
Mountain Climbers exercise illustration
Mountain Climbers
1 sets
50 reps
0:30 rest
Crunches exercise illustration
Crunches
1 sets
30 reps
0:30 rest
Reverse Crunch exercise illustration
Reverse Crunch
1 sets
30 reps
0:30 rest
Plank Shoulder Taps exercise illustration
Plank Shoulder Taps
1 sets
30 reps
0:30 rest
Jackknife Sit-up exercise illustration
Jackknife Sit-up
1 sets
20 reps
simple toe touches
0:30 rest
Bosu Ball Leg Pull-ins exercise illustration
Bosu Ball Leg Pull-ins
1 sets
20 reps
no ball required
0:30 rest
Lying Leg Raises exercise illustration
Lying Leg Raises
1 sets
20 reps

About this workout

300 rep Core Workout is a free 20 min workout plan with 9 illustrated exercises for your abs and legs. Follow the workout online, save it to your WorkoutLabs Fit account or download it as a printable PDF.

Tap any exercise in the workout to see the muscles worked, clear exercise illustrations and step-by-step instructions. Each workout includes sets, reps, rest times and notes so you can follow the plan without guessing.

Workout details

  • Duration: 20 min
  • Exercises: 9
  • Training focus: Abs and legs
  • Format: Interactive workout and printable PDF

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Questions about this workout

How long does the 300 rep Core Workout take?

The full workout takes about 20 minutes, covering 9 exercises with prescribed sets, reps and rest periods. Using the built-in timers and auto-advance keeps you on pace from start to finish.

What muscles does this workout target?

This routine primarily works your abs, obliques, glutes & hip flexors. Tap any exercise in the workout to see a muscle diagram showing exactly which primary and secondary muscles it activates.

How often should I do this workout?

For best results, do this workout 2–3 times per week with at least one rest day in between, and pair it with sessions that target other muscle groups.

Can I download or save this workout?

Yes – you can download this workout as a free printable PDF using the download button, or save it to a free WorkoutLabs Fit account to follow it on your phone, customize the exercises and track your progress.

300 rep Core Workout
20 min
 · 
9 exercises
Go through it all at once or break it down into rounds - your choice
Auto-advance Start exercises automatically
after a 5-second delay
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Bicycles
Bicycles exercise illustration
1 sets
50 reps
Set 1 of 1
Rest before next set
Get ready
321GO
Primary muscle group(s):
Abs, Obliques
Secondary:
Glutes & Hip Flexors, Quadriceps
  1. Lie flat on an exercise mat on the floor keeping your lower back straight with no arching of your spine and with your knees bent and feet flat on the floor.
  2. Place your hands lightly on the sides of your head.
  3. Curl your torso upwards so your shoulders are slightly raised off the floor..
  4. Raise your knees until your thighs are at a right angle to the floor and your calves are parallel to the floor. This is the start position.
  5. Slowly move your legs in a pedaling action as if you are riding a bicycle.
  6. As you do so, exhale and bring your opposing elbow close to each knee by crunching to one side. Left elbow to right knee. Right elbow to left knee.
  7. After each crunch, return to the start position inhaling as you do so.
  8. Without pausing, repeat the movement to the other side.
  9. Repeat without pausing for the desired number of repetitions to each side.

Do not use your hands to pull your head and neck up during this exercise. Doing so may cause injury. Concentrate on a slow rhythmic cycle from side to side with perfect form for each repetition.

Primary muscle group(s):
Abs
  1. Lie on your back. Bring your knees up to a 90-degree angle. Shins should be parallel to the floor. Place your hands behind your head and bring your shoulders off the ground.
  2. Exhale and contract your abdominals. Bring your head towards your knees while moving your knees toward your chest.
  3. Pause and return to the starting position.
Primary muscle group(s):
Obliques
Secondary:
Abs
  1. Lie on an exercise mat, with your back flat, knees bent and your feet flat on the floor slightly wider than shoulder-width apart.
  2. Fully extend your arms down the side of your body, palms facing in. This is the start position.
  3. Exhaling, crunch your torso forward and to the right until you can touch your right heel with your right hand. Hold for a count of one.
  4. Return to the starting position smooth motion, inhaling as you do so.
  5. Repeat the movement, this time to your left side.
  6. When you have completed the movement on both sides, you have done one repetition.
  7. Repeat.
Primary muscle group(s):
Abs
Secondary:
Glutes & Hip Flexors
  1. Lie on a mat with your hands under your buttocks and raise your legs slightly, keeping knees straight and ankles together.
  2. Keep abs engaged and perform short kicks in an alternating fashion.
  3. Repeat as needed and then lower legs to the ground.
Rest
0:00
next up
Weighted Russian Twists
Next
Weighted Russian Twists
Weighted Russian Twists exercise illustration
1 sets
50 reps
Set 1 of 1
Rest before next set
Get ready
321GO
Primary muscle group(s):
Abs, Obliques
Secondary:
Biceps, Forearms, Lower Back
  1. Sit on an exercise mat with your legs fully extended and your upper body upright.
  2. Grip a weight plate between both hands.
  3. Hold the plate out in front of your abdominals keeping your arms bent slightly.
  4. Cross your your ankles and raise them off the floor slightly.
  5. Bend your knees towards you slightly.
  6. Lean back about 15 degrees to balance your body. This is the start position.
  7. In a smooth motion,turn your torso to the left and touch the plate on the floor. Make sure you exhale as you do this.
  8. Return to the start position inhaling as you do so.
  9. Repeat the same movement, this time to your right side, again exhaling as you do so.
  10. Return to start position and repeat.

When performing this exercise, use smooth controlled movements. Jerking or using momentum to swing the weight can cause serious lower back injury.

Primary muscle group(s):
Abs, Obliques
Secondary:
Glutes & Hip Flexors, Quadriceps
  1. Lie flat on an exercise mat on the floor keeping your lower back straight with no arching of your spine and with your knees bent and feet flat on the floor.
  2. Place your hands lightly on the sides of your head.
  3. Curl your torso upwards so your shoulders are slightly raised off the floor..
  4. Raise your knees until your thighs are at a right angle to the floor and your calves are parallel to the floor. This is the start position.
  5. Slowly move your legs in a pedaling action as if you are riding a bicycle.
  6. As you do so, exhale and bring your opposing elbow close to each knee by crunching to one side. Left elbow to right knee. Right elbow to left knee.
  7. After each crunch, return to the start position inhaling as you do so.
  8. Without pausing, repeat the movement to the other side.
  9. Repeat without pausing for the desired number of repetitions to each side.

Do not use your hands to pull your head and neck up during this exercise. Doing so may cause injury. Concentrate on a slow rhythmic cycle from side to side with perfect form for each repetition.

Rest
0:00
next up
Mountain Climbers
Next
Mountain Climbers
Mountain Climbers exercise illustration
1 sets
50 reps
Set 1 of 1
Rest before next set
Get ready
321GO
Primary muscle group(s):
Abs, Glutes & Hip Flexors
Secondary:
Chest, Shoulders
  1. Place your hands flat on the floor, shoulder width apart.
  2. Extend your torso and legs fully behind you with only your toes and balls of your feet touching the floor.
  3. Your body should be in a straight line, with your weight supported on your hands and toes only.
  4. Starting with either leg, flex your knee and hip at the same time to bring your knee up and under your hip. Your other leg should remain fully extended. This is the start position.
  5. Using an explosive movement, reverse the position of your legs, by extending the bent leg back and simultaneously flexing the straight leg until it is in the startposition.
  6. Continue alternating in this manner for the desire amount of time.
Rest
0:00
next up
Crunches
Next
Crunches
Crunches exercise illustration
1 sets
30 reps
Set 1 of 1
Rest before next set
Get ready
321GO
Primary muscle group(s):
Abs
  1. Lie flat on your back with your feet flat on the ground, with your knees bent at 90 degrees. Alternatively, you can place your feet up on a bench a few inches apart with your toes turned inwards and touching.
  2. Place your hands lightly on either side of your head.
  3. Keep your elbows in  so that they are parallel to your body.
  4. Push your back down flat into the floor to isolate your abdominal muscles.
  5. Gently curl your shoulders forward and up off the floor.
  6. Continue to push down into the floor with your lower back.
  7. Raise your shoulders about four to six inches only.
  8. Hold and squeeze your abdominal muscles for a count of one.
  9. Return to the start position in a smooth movement.
Primary muscle group(s):
Obliques
Secondary:
Abs
  1. Lie on an exercise mat, with your back flat, knees bent and your feet flat on the floor slightly wider than shoulder-width apart.
  2. Fully extend your arms down the side of your body, palms facing in. This is the start position.
  3. Exhaling, crunch your torso forward and to the right until you can touch your right heel with your right hand. Hold for a count of one.
  4. Return to the starting position smooth motion, inhaling as you do so.
  5. Repeat the movement, this time to your left side.
  6. When you have completed the movement on both sides, you have done one repetition.
  7. Repeat.
Primary muscle group(s):
Abs
  1. Lay on a yoga/exercise mat or towel with your back flat on the floor and your legs straight and in the air with the soles of your feet facing up.
  2. Outstretch your arms above your chest so that they run parallel to your legs.
  3. Lifting your shoulders off the floor, reach up and touch your toes with your fingertips.
  4. Lower your shoulders back to the floor to complete one rep.
Rest
0:00
next up
Reverse Crunch
Next
Reverse Crunch
Reverse Crunch exercise illustration
1 sets
30 reps
Set 1 of 1
Rest before next set
Get ready
321GO
Primary muscle group(s):
Abs
  1. Lie flat on an exercise mat on the floor.
  2. Extend your legs fully and place your hands palms down, flat on the floor beside you.
  3. Keeping your feet together, draw your knees up towards your chest, until your thighs are at 90 degrees to the floor and your calves are parallel to it. This is the start position.
  4. As you inhale, curl your hips up off the floor while bringing your knees further towards your chest.
  5. Continue the movement until your knees are touching your chest, or as far as comfortable.
  6. Hold for a count of one.
  7. In a controlled movement, return your legs to the start position, exhaling as you do so.
  8. Repeat.
Primary muscle group(s):
Abs, Obliques
Secondary:
Glutes & Hip Flexors
  • Lie on your back on a flat bench.
  • Reach overhead and grab the top of the bench with both hands.
  • Brace your abdominal muscles.
  • Straighten your legs and lift them up. Stop when they are above parallel.
  • Contract your abdominals as you bend your knees and bring your legs up and towards the top of the bench.
  • Pause then slowly release your legs to the starting position, making sure to keep the contraction in your abdominals.
Primary muscle group(s):
Abs
Secondary:
Lower Back
  1. Lie on your back on a mat with hands under your lower buttocks on either side to support your pelvis.
  2. Legs straight out in front of you, ankles together and feet slightly off the floor.
  3. Keep your knees straight and raise your legs by flexing the hips until they are completely flexed.
  4. Return to starting position.
Primary muscle group(s):
Abs
Secondary:
Lower Back
  1. Lie flat with hands under your buttocks.
  2. Keep your knees together and pull them in towards you while moving your torso towards them (lift your head, neck and shoulders up).
  3. Hold and then slowly return to starting position.
Rest
0:00
next up
Plank Shoulder Taps
Next
Plank Shoulder Taps
Plank Shoulder Taps exercise illustration
1 sets
30 reps
Set 1 of 1
Rest before next set
Get ready
321GO
Primary muscle group(s):
Abs
Secondary:
Lower Back
  1. Lock yourself in the plank push-up position ensuring that your body forms a straight line from shoulders to heels.
  2. Bring your right arm off the ground and touch your left shoulder before placing it back on the ground.
  3. Repeat the same movement for the opposing arm.
Rest
0:00
next up
Jackknife Sit-up
Next
Jackknife Sit-up
Jackknife Sit-up exercise illustration
1 sets
20 reps
Set 1 of 1
Rest before next set
Get ready
321GO
simple toe touches
Primary muscle group(s):
Abs
Secondary:
Glutes & Hip Flexors
  1. Lie flat on an exercise mat, extending your arms straight back behind your head.
  2. Fully extend your legs also. This is the start position.
  3. Bend at your waist and at the same time, raise your legs and arms to meet in a closed jackknife position. Exhale as you do this.
  4. At this point, your legs should remain fully extended at between 35-45 degrees from the floor.
  5. Your arms should be fully extended, parallel to your legs.
  6. Your upper body should be raised off the floor.
  7. Return to the start position by lowering your arms and legs back to the floor, exhaling as you do so.
  8. Repeat.
Primary muscle group(s):
Abs
  1. Lie flat on your back with your feet flat on the ground, with your knees bent at 90 degrees. Alternatively, you can place your feet up on a bench a few inches apart with your toes turned inwards and touching.
  2. Place your hands lightly on either side of your head.
  3. Keep your elbows in  so that they are parallel to your body.
  4. Push your back down flat into the floor to isolate your abdominal muscles.
  5. Gently curl your shoulders forward and up off the floor.
  6. Continue to push down into the floor with your lower back.
  7. Raise your shoulders about four to six inches only.
  8. Hold and squeeze your abdominal muscles for a count of one.
  9. Return to the start position in a smooth movement.
Primary muscle group(s):
Abs
  1. Position yourself on a decline bench so that your feet are secured by the pads. Lay back and place your arms across your chest or behind your head.
  2. Begin the movement by pulling yourself up by your abdominals. Do not force yourself up by pulling on your neck. Let your abs do all the work.
  3. Once at the top, slowly lower yourself back down. Again, focus on the abs doing all of the work. Repeat by bringing yourself back up.
Rest
0:00
next up
Bosu Ball Leg Pull-ins
Next
Bosu Ball Leg Pull-ins
Bosu Ball Leg Pull-ins exercise illustration
1 sets
20 reps
Set 1 of 1
Rest before next set
Get ready
321GO
no ball required
Primary muscle group(s):
Abs, Obliques
Secondary:
Glutes & Hip Flexors, Lower Back
  • Place a BOSU Ball on the ground with the blue rubber side facing up. Carefully, sit yourself in the middle of the BOSU Ball and place your hands by your side for balance. Bring your knees towards your chest and hold this position.
  • Slowly, extend your legs out while keeping a slight bend in your knees. Simultaneously, lean back while focusing the contraction on your core. Keep your balance with your elbows and forearms. Pause, hold the contraction, then return to the starting position.
  • Repeat.
Rest
0:00
next up
Lying Leg Raises
Next
Lying Leg Raises
Lying Leg Raises exercise illustration
1 sets
20 reps
Set 1 of 1
Rest before next set
Get ready
321GO
Primary muscle group(s):
Abs
Secondary:
Lower Back
  1. Lie on your back on a mat with hands under your lower buttocks on either side to support your pelvis.
  2. Legs straight out in front of you, ankles together and feet slightly off the floor.
  3. Keep your knees straight and raise your legs by flexing the hips until they are completely flexed.
  4. Return to starting position.
Primary muscle group(s):
Abs
Secondary:
Glutes & Hip Flexors
  1. Lie on a mat with your hands under your buttocks and raise your legs slightly, keeping knees straight and ankles together.
  2. Keep abs engaged and perform short kicks in an alternating fashion.
  3. Repeat as needed and then lower legs to the ground.
Primary muscle group(s):
Abs
Secondary:
Lower Back
  1. Lie flat with hands under your buttocks.
  2. Keep your knees together and pull them in towards you while moving your torso towards them (lift your head, neck and shoulders up).
  3. Hold and then slowly return to starting position.
Workout done!
Exercises done
of 9
Total time
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