PLANK

This deceptively simple exercise is the secret to rock-hard abs. The plank position engages the transverse abdominals, which aid in stabilization of the spine and pull in the tummy. It helps develop strength in the core, shoulders, and glutes.

progression

  LEVEL 1: Plank
  LEVEL 2: Diagonal Mountain Climber
  LEVEL 3: 1-2 Push
187.png

Place your forearms on the floor and extend your legs until your body is balanced between your toes and forearms. Your elbows should be directly beneath your shoulders and your body should form a straight ...

Get High Intensity Interval Training now with O’Reilly online learning.

O’Reilly members experience live online training, plus books, videos, and digital content from 200+ publishers.