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20-Minute Core Blaster

20 min
 · 
7 exercises
If you've only got 15 minutes to blast that core, this workout is for you! Do your absolute best to maintain form and stick with the times instructed!
A
Crunches
2 sets
45 secs
Complete these non stop for 45 seconds
A
Oblique Crunches
2 sets
30 secs
45 sec rest
Left side only here! Non stop for 30 seconds!
0:30 rest
B
Crunches
2 sets
45 secs
Complete these non stop for 45 seconds
B
Oblique Crunches
2 sets
30 secs
45 sec rest
Right side only here! Non stop for 30 seconds!
0:30 rest
C
Bird Dogs
2 sets
60 secs
Complete the core by training that lower back!
C
Dead Bug
2 sets
60 secs
45 sec rest
Flip things over and perform these for 60 seconds!
1:00 rest
Jackknife Sit-up
3 sets
45 secs
15 sec rest
Hit those reps!
This 20-Minute Core Blaster 20 min-minute gym workout plan effectively targets your abs and back. Easily follow this workout with confidence on your phone or printable exercise program with our clear exercise demonstrations. You can also look up step-by-step instructions for each of the 7 exercises and see which muscle groups they target. Enjoy!

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20-Minute Core Blaster
20 min
 · 
7 exercises
If you've only got 15 minutes to blast that core, this workout is for you! Do your absolute best to maintain form and stick with the times instructed!
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Crunches
A
2 sets
45 secs
Superset A • Set 1 of 2
Rest before next set
Get ready
321GO
Complete these non stop for 45 seconds
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.
Oblique Crunches
A
2 sets
30 secs
45 sec rest
Superset A • Set 1 of 2
Rest before next set
Get ready
321GO
Left side only here! Non stop for 30 seconds!
Primary muscle group(s):
Obliques
  1. Lie on a padded surface on your left side. Stack your legs and bring your right hand behind your head. Lie your left arm in front of you or across your body. Brace your core.
  2. Pulling from the obliques, bring your elbow up and towards your feet. Do NOT pull yourself with your hand.
  3. Pause and feel the contraction in your obliques then slowly 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.
Rest
0:00
next up
Superset B - Crunches, Oblique Crunches
Next
Crunches
B
2 sets
45 secs
Superset B • Set 1 of 2
Rest before next set
Get ready
321GO
Complete these non stop for 45 seconds
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.
Oblique Crunches
B
2 sets
30 secs
45 sec rest
Superset B • Set 1 of 2
Rest before next set
Get ready
321GO
Right side only here! Non stop for 30 seconds!
Primary muscle group(s):
Obliques
  1. Lie on a padded surface on your left side. Stack your legs and bring your right hand behind your head. Lie your left arm in front of you or across your body. Brace your core.
  2. Pulling from the obliques, bring your elbow up and towards your feet. Do NOT pull yourself with your hand.
  3. Pause and feel the contraction in your obliques then slowly 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.
Rest
0:00
next up
Superset C - Bird Dogs, Dead Bug
Next
Bird Dogs
C
2 sets
60 secs
Superset C • Set 1 of 2
Rest before next set
Get ready
321GO
Complete the core by training that lower back!
Primary muscle group(s):
Abs, Lower Back
Secondary:
Glutes & Hip Flexors
  1. Position yourself on all fours with knees underneath the hips and wrists under the shoulders.
  2. Engage your abs and keep your spine neutral, pulling the shoulder blades towards the hips.
  3. Lengthen the left leg until it is straight out and in line with your hips while simultaneously raising and straightening your right arm until it is parallel to the floor. Keep your head and shoulders aligned at all times.
  4. Gently lower your arm and leg back to the starting position and alternate with the other arm and leg.
Primary muscle group(s):
Glutes & Hip Flexors, Upper Back & Lower Traps
Secondary:
Lower Back, Shoulders
    1. Lay on a yoga/exercise mat or towel with your arms outstretched, palms down in front of you, and your legs outstretched with your soles facing up.
    2. Simultaneously lift your right arm and left leg off the floor.
    3. When you reach your flexion point, hold for a second before slowly lowering back down to the floor.
    4. Repeat the same movement with your left arm and right leg.

 

 

 

Primary muscle group(s):
Glutes & Hip Flexors
Secondary:
Abs
  1. Position yourself on all fours on a mat.
  2. Position your hands underneath your shoulders and place your knees under your hips.
  3. Keep your right knee bent at 90 degrees and flex the foot as you lift the knee until it is level with the hip.
  4. Lower the knee without touching the floor and repeat the lift.
  5. Once you’ve completed the reps on the right leg, switch legs.
Dead Bug
C
2 sets
60 secs
45 sec rest
Superset C • Set 1 of 2
Rest before next set
Get ready
321GO
Flip things over and perform these for 60 seconds!
Primary muscle group(s):
Abs
  1. Lie on your back. Extend hands straight above towards the ceiling. Bring your knees up to a 90-degree angle. Shins should be parallel to the floor. Exhale and bring hips off the floor.
  2. Begin by extending one leg forward. The foot should be hovering just above the ground.
  3. Pause then return the leg to it’s starting position while extending the opposing leg. Keep alternating legs while maintaining a tight core.
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
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.
Rest
0:00
next up
Jackknife Sit-up
Next
Jackknife Sit-up
3 sets
45 secs
15 sec rest
Set 1 of 3
Rest before next set
Get ready
321GO
Hit those reps!
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.
Workout done!
Exercises done
of 7
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