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Program

Exercise Guide

1RM Calculator

Jackknife

Abs

Muscle Area

Front
Back
Primary Muscles
Abs
Secondary Muscles

Exercise Description

Starting Position 1. Lie on your back on the floor. 2. Extend your legs straight and stretch your arms overhead. During the Exercise 1. Use your abdominal muscles to lift both your upper body and legs simultaneously, bringing your hands and feet to meet. 2. Slowly return to the starting position. Breathing Tips Exhale as you lift your upper body and legs, and inhale as you return to the starting position.

Video Guide

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Back routine including 'Jackknife'

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