• Begin in push-up position with feet and shins on physioball and hands on ground
• Keeping body in straight line, roll ball toward hands by pulling knees toward chest
• Slowly straighten legs and repeat

Sets/Reps: 3x8; work up to 15 reps, then perform advanced variation
Advanced: One leg at a time
Problem Solved: Weak hip flexors and abdominals
Peacock: If a guy is having trouble getting his knees high while sprinting, we have him do these to build strength in his hip flexors and core.