Samson Liaw
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The Primal Blueprint 21-Day Challenge Infographic | Mark's Daily Apple

The Primal Blueprint 21-Day Challenge Infographic | Mark's Daily Apple

Plank/Pelvis Tuck: This exercise works both the rectus abdominus (six-pack) and transverse abdominus (waist-cinching corset muscles). #plank #abs | Health.com

Plank/Pelvis Tuck: This exercise works both the rectus abdominus (six-pack) and transverse abdominus (waist-cinching corset muscles). #plank #abs | Health.com