Forearm Plank Pike
Also known as: forearm plank to pike, plank to pike, plank pike, butt ups, butt-ups, forearm plank pike ups
- Primary muscleAbs
- EquipmentBodyweight
- DifficultyBeginner
- TypeCore · Core flexion
- Secondary muscles
- Hip Flexors, Spine
- Body part
- Core
- Position
- Lying
- Laterality
- Bilateral (both sides together)
- Category
- Strength
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Starting from a forearm plank, you drive your hips up toward the ceiling into a pike and lower back to a flat line, so the abs work by folding the body rather than curling the shoulders. Reps stay honest when the elbows keep pressing into the floor and the full plank position returns between pikes.
How to do the Forearm Plank Pike
- Lie flat on your back with your knees bent and feet flat on the ground.
- Place your hands by your sides, palms facing down.
- Engaging your abs, lift your legs off the ground, bringing your knees towards your chest.
- At the top of the movement, squeeze your abs and pause for a moment.
- Slowly lower your legs back down to the starting position.
- Repeat for the desired number of repetitions.
Tip: Breathe out as you crunch and let the last bit of air leave the lungs at the top of each rep.
Muscles worked
Primary
Abs · Core
The rectus abdominis shortens to bend the spine forward, and each rep should end with the upper abs fully contracted and the ribs pulled down.
Secondary
- Hip Flexors — The hip flexors take over if your feet are anchored and you come up too high; keep the range short to leave them out.
- Spine
Common mistakes
- Pulling on the neck — hands behind the head should support, not yank; keep the elbows wide and the chin about a fist away from the chest.
- Sitting all the way up — a crunch is a curl of the ribs toward the pelvis, not a sit-up; the lower back should stay on the floor the whole time.
- Cranking out fast reps — momentum does the work if you bounce; lift to a squeeze, hold for a count and lower slowly.
- Never adding load — once bodyweight reps get easy, hold a plate on the chest or use a cable rather than doing sets of 50.
Sets, reps and where it fits
| Goal | Sets × reps | Rest |
|---|---|---|
| Strength | 3 × 8–12 | 60 s |
| Endurance | 2–3 × 15–25 | 45 s |
Crunches close out a session after the heavy work, or they can fill the rest periods between sets of a lift that does not need much bracing. Pair a cable crunch with a cable side bend on the same stack.
Variations and alternatives
Similar exercises
Without bodyweight
Frequently asked questions
What muscles does the Forearm Plank Pike work?
The Forearm Plank Pike primarily works the abs. It also involves the hip flexors and spine, which assist the movement and stabilise the joints.
Is the Forearm Plank Pike good for beginners?
Yes. The Forearm Plank Pike is rated beginner: it uses no equipment beyond your bodyweight and the movement is simple to learn. Start light, focus on the full range of motion and add load once every rep looks the same.
What can I do instead of the Forearm Plank Pike?
If you cannot do the Forearm Plank Pike, try the Cocoon Crunch, the Flat Bench Knee Tuck or the Cross Body Knee Crunch. Each of them trains the abs through a similar movement, so you can swap them in without changing the rest of the workout.
How many sets and reps should I do?
It depends on your goal. For the Forearm Plank Pike, a sensible starting point is strength: 3 × 8–12 with 60 s rest; endurance: 2–3 × 15–25 with 45 s rest. Train it at the end of a session or pair it with a lower-body lift as active rest.
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