COHORT CAPACITY: 94% FULL
|
Only 4 Spots Left

Free Calorie Meal Plans & Metabolic Science

Reviewed by Matt, NASM CPT
Free Tool

Is Your Metabolism Slow or "Stuck"?

Take our 60-second audit to see if hormonal resistance is blocking your results.

Prone Stability Ball Straight Leg Jackknifes

Strength Intermediate

How to Do

How to Do Prone Stability Ball Straight Leg Jackknifes

The prone stability ball straight leg jackknifes should begin with good posture to avoid injury. Brace the spine by drawing your lower abdomen inward. Your core muscles should be activated to support your posture as you perform the exercise.

If any pain is experienced, immediately stop the prone stability ball straight leg jackknifes.

Beginning

Beginning Straight Leg Jackknifes

1. Begin by lying on your back on a yoga mat, legs extended in front of you and arms extended above your head.

2. Draw your belly button in towards your spine to engage your abdominal muscles, and lift your legs off the mat slightly. This is where you'll begin.

Movement

Straight Leg Jackknifes Movement

1. Inhale. Exhale. Bend your knees and draw them in towards your chest using your abdominals, keeping your feet together. At the same moment, progressively elevate your head, shoulder blades, and body off the surface by bringing your hands forward towards your feet.

2. Inhale. Return to the beginning position by slowly lowering your arms and extending your legs, but without dropping your feet to the floor.

3. Exhale. Slowly raise your legs upwards, keeping them stretched, until they make a 90-degree angle with your hips. At the same time, steadily elevate your head, shoulder blades, and body off the mat by bringing your hands forward and upward towards your feet.

4. Inhale. Return to the beginning position by slowly lowering your arms and legs, but do not lower your feet to the floor. Throughout the activity, you should feel tension in your core. For the given number of repetitions, alternate between bent- and straight-leg jackknifes. One repetition is equal to one jackknife.

Benefits

Straight Leg Jackknifes Benefits

An abdominal exercise is a jackknife. A "V-Up" is another name for this exercise. The upper and lower abdominal muscles, notably the transversus abdominis muscle, are strengthened by jackknife exercises.

Exercise Aliases

Swiss Ball Jackknife, Stability Ball Jackknife.

Prone Stability Ball Jackknife Push Up With Bent Knees, Get My Free Fitness App

Start your exercise now!

Prone Stability Ball Single Leg Jackknife Push Up With Bent Knees Exercise, Get My Free Fitness App

Start your exercise now!

Prone Stability Ball Jackknife With Bent Knees

Start your exercise now!

Prone Stability Ball Single Bent Leg Jackknife

Start your exercise now!

Prone Stability Ball Single Straight Leg Jackknifes

Start your exercise now!

Research Corner

Clinical Data
Journal of Cardiovascular Nursing

📚 Coaching Delivers 4.73 lbs MORE Weight Loss

Research proves that combining coaching with app-based programs results in significantly greater weight loss than apps alone.

Breakthrough Study (July 2025)
Duke University (PNAS)

"You Can't Outrun a Bad Diet"

90% of obesity is driven by diet, not lack of movement. Your body has a "Metabolic Thermostat." When you exercise more, it burns less energy elsewhere to keep you stable.

Founder Offer

This Plan is Generic. You Need Specific.

This sample menu works for an "average" person. But you aren't average. Your hormonal profile, weight history, and activity level require exact macro targets to work.

Get your personalized plan + 1-on-1 coaching to adjust it as you progress.

GET MY CUSTOM PLAN (SAVE $400)
TAKING NEW CLIENTS
OPEN

89%
Retention Rate

When paired with a human coach.

Verified by Journal of Cardiovascular Nursing
BEFORE
AFTER
VERIFIED LEGACY MEMBER
Sean Flora
Lost 40 lbs
Join 13 others analyzing now...

DOES THIS SOUND LIKE YOU?

"I am eating the same (or less) than I did 5 years ago, but my midsection is getting larger."

We hear this from 93% of our members. This is a classic sign of Insulin Resistance. Your audit will confirm this.
START FREE METABOLIC AUDIT ➜
Takes 60 seconds • No credit card required