Plank

Abs Workouts

Nonstop Ab Workout

Eric Velazquez, NSCA-CSCS

Abs Workouts

Get a Ripped Sixer by Summer

Michael Berg NSCA CPT

Strength

The Groundwork Training Guide

Lee Boyce, CPTN-CPT

Bodyweight Training

The Best Bodyweight Exercises to Get You Ripped

Muscle & Performance