321 STRONG Mat for Ab Muscle Workout
Provides full range of motion for training obliques and ab muscles , doing crunches and sit-ups
Removes strain and stress from your lower back and maximizes the effectiveness of every sit up , crunch , and six inchers on your abs
Ergonomically designed to mimic the curve of your lumbar so that you get a full extension on the way down and utilize your full range of contraction on the way up
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