Janda Sit-up exercise animation (Male)

Janda Sit-up

Target muscle
Rectus Abdominis
Synergist muscles
Obliques
Equipment
Body weight
Body part
Waist
Type
Strength

The Janda sit-up is a bodyweight core exercise, named after Czech physiotherapist Vladimir Janda, that targets the rectus abdominis with strong involvement from the obliques. Actively pressing your heels into the floor contracts the hamstrings and glutes, which inhibits the hip flexors and forces the abdominals to generate the movement. Use it in place of a standard sit-up when you want the abs, not the hips, doing the work.

How to do the Janda Sit-up

  1. 1Lie on your back with your knees bent at roughly 90 degrees and your feet flat on the floor, hip-width apart.
  2. 2Place your hands behind your head with your fingers lightly supporting your skull — avoid interlacing them and pulling on your neck.
  3. 3Dig your heels firmly into the floor and actively contract your hamstrings and glutes as if you are trying to drag your heels toward your hips. Maintain this contraction throughout the set.
  4. 4Keeping your chin slightly tucked, curl your torso upward by drawing your ribcage toward your pelvis, leading with your chest rather than your elbows.
  5. 5Continue rising only until your abs are fully shortened — roughly when your shoulder blades and mid-back have cleared the floor — and stop before your hips take over.
  6. 6Pause briefly at the top and squeeze your abs.
  7. 7Lower yourself back down under control, maintaining the heel-pressing tension the entire way.
  8. 8Repeat for the desired number of repetitions.

Form tips

  • The heel-pressing cue is the defining technique of this exercise — if you lose that contraction, the hip flexors take over and the abs disengage.
  • Think of curling your ribs toward your hips rather than sitting up straight; this keeps the movement in the abs rather than the hip flexors.
  • Move at a controlled tempo — roughly two seconds up and two seconds down — to maximize time under tension on the abs.
  • Keep your lower back from arching away from the floor at the start of each rep; a neutral spine ensures the abs initiate the curl.

Common mistakes

  • Relaxing the heel press mid-rep, which lets the hip flexors dominate and reduces stress on the rectus abdominis.
  • Pulling the neck forward with the hands, which strains the cervical spine and shifts effort away from the abs.
  • Using momentum to swing the torso up instead of curling slowly, which bypasses the abs and reduces the exercise's effectiveness.
  • Rising too high so the hip flexors take over at the top of the movement — stop when the abs are fully shortened, not when you are fully upright.
  • Holding your breath, which increases intra-abdominal pressure unnecessarily and limits core control — exhale as you curl up.

Frequently asked questions

What is the difference between a Janda sit-up and a regular sit-up?

In a regular sit-up the hip flexors assist heavily, often doing most of the work. The Janda sit-up uses reciprocal inhibition: actively contracting the hamstrings and glutes while pressing the heels into the floor neurologically inhibits the hip flexors, shifting the entire load to the rectus abdominis.

Do I need any equipment to perform a Janda sit-up?

No equipment is required — you only need a flat surface and room to lie down. Avoid hooking your feet under a bench or having a partner pin your ankles: anchored feet let the hip flexors pull you up, which is exactly what this variation is built to prevent.

How many reps should I do per set?

Because the hip flexors are inhibited, most people find the Janda sit-up significantly harder than a standard sit-up. Start with 3 sets of 8–12 controlled reps, focusing on quality over quantity, and add reps only when you can maintain proper heel-pressing tension throughout.

Can the Janda sit-up help with lower back pain?

Vladimir Janda originally developed the movement specifically to reduce hip flexor dominance, which is a common contributor to lower back strain. By training the abs without over-activating the hip flexors, you can improve the muscle balance that supports the lumbar spine. If you already have lower back pain, consult a healthcare professional before adding any sit-up variation.

Where should I feel the Janda sit-up working?

You should feel the burn primarily across the front of your abdomen (rectus abdominis) and to a lesser degree on the sides (obliques). If you feel it mostly in your thighs or hip region, the hip flexors are still dominating — refocus on pressing your heels hard into the floor.

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