Lie on stomach with elbows bent under you
Raise body into air until only elbows and toes are touching ground
Your body should be flat from head to toe. Keep abs and buttocks tight.
Hold for 10 seconds, lower and repeat
MODIFIED: Lift body only to elbows and knees.
ADVANCED: Lift one leg about 6" while in the plank. Hold 3-5 seconds, then switch legs.