wight
Muscle Contraction Both plank exercise and crunches are isometric exercises but their main difference lies in how the muscles contract while you perform each exercise. When you do a plank exercise, isometric contraction DSN Post Workout of the muscles occur because you are holding this position for a specified time. The muscles of your core are exerting maximum force to hold this position, thereby strengthening it. While doing crunches, eccentric contraction of the muscles take place when you lower your upper body to the ground and concentric contraction occurs when you lift your upper body off the floor. http://www.supplementsoffer.com/dsn-post-workout
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