This 30-day push-up challenge will strengthen your entire upper body and core thanks to a variety of push-ups and planks. This 30-day push-up challenge is perfect for beginners and experts alike.
The 30-Day Well Challenge - The New York Times
Livestrong.com: The 30-Day Push-Up Challenge: Week 1
How will my life change if I do 200 push-ups every day? - Quora
Marc's 30 Day Squat, Abs and Push Up Challenge – Marc Hemingway
The 30-Day Push-Up Challenge for Upper-Body Strength
Wall Push-Ups Challenge
How to Increase Push-Ups for Your Fitness Test
White Label PUSH UP 21 Day Challenge – White Label Workouts
30-Day Pushup Challenge to Build Chest Strength and Endurance
The 4-Week PUSH-UP Challenge (Complete Workout Routine!)