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Otis Up Waist Max

Otis Up Waist Max is an intermediate bodyweight exercise for the primary: obliques secondary: rectus abdominis. Most lifters train it for 2 to 3 sets of 8 to 12 reps.

Starting flat on your back with a weight plate held at your chest, you sit up and keep rotating until you reach a fully upright, twisted finish position. Combining a sit up and a rotation in one continuous rep works the front and side of the core rather than just the six-pack muscles.

AbsBodyweight
Otis Up Waist Max
Primary muscle
Primary: Obliques Secondary: Rectus abdominis
Equipment
Bodyweight
Difficulty
Intermediate
Typical volume
2–3 sets × 8–12 reps
Category
Abs

How to Do the Otis Up Waist Max

  1. Lie on your back with knees bent and feet anchored under a pad, bench or partner's hands.
  2. Hold a weight plate against your chest with both hands, elbows pointing out to the sides.
  3. Brace your abs and curl your head and shoulders off the floor to begin the sit-up.
  4. Continue sitting up until your torso is upright, keeping the plate tight to your chest.
  5. At the top, press the plate straight overhead until the arms lock out above the shoulders.
  6. Bring the plate back to the chest, then lower your torso slowly to the floor under control.
  7. Touch the shoulder blades to the floor briefly and begin the next rep without bouncing.

Common Mistakes

  • Yanking with the arms: Swinging the plate forward to start the sit-up uses momentum instead of the abs. Keep the plate pinned to the chest until you are fully upright.
  • Pressing too early: Pushing the plate overhead while still leaning back loads the lower back and shoulders. Only press once the torso is vertical.
  • Dropping on the way down: Falling back to the floor wastes the eccentric phase. Lower for two to three seconds.
  • Arching the low back: Starting each rep with a big arch strains the spine. Curl up one vertebra at a time with ribs pulled down.

Programming Tips

Program 2 to 3 sets of 8 to 12 reps at the end of a training session or as part of a core circuit. The Otis-up combines trunk flexion with an overhead press, so it builds abdominal strength under load and teaches you to brace while the arms move overhead, a useful skill for overhead lifts.

Anchor the feet securely and choose a plate that you can press overhead easily while seated. Most people start with 5 kg, moving to 10 kg once 12 smooth reps are achievable, and stronger lifters may use 15 to 20 kg. The most common fault is throwing the plate forward to get up. Fix it by holding the plate firmly against the sternum, slowing the sit-up and choosing a lighter plate until the abs initiate every rep.

Common Questions

What does an Otis-up work?

It works the rectus abdominis and hip flexors during the sit-up, plus the shoulders and triceps during the overhead press. The obliques help stabilize.

How heavy should the plate be for Otis-ups?

Start with 5 to 10 kg and increase only when you can do 12 clean reps with a strict press at the top. Strong lifters rarely need more than 20 kg.

Are Otis-ups bad for your back?

They are not inherently bad, but anchored sit-ups do load the lumbar spine. People with disc problems may prefer crunches or planks instead.

Otis-up vs weighted sit-up, what is the difference?

A weighted sit-up just holds the plate at the chest, while the Otis-up adds an overhead press at the top. That adds shoulder work and a stability challenge.

Track This Exercise in the App

Log your otis up waist max sets in 1RM.fit and watch your estimated 1RM update automatically as you get stronger.

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