I swapped the gym for Schwarzenegger's two-move bodyweight workout, and it showed you can build muscle without weights
The Push-Up Board (Waste of Money or Useful?)
30-Day Pushup Challenge to Build Chest Strength and Endurance
10 Day Push Up Challenge
Push-Up Challenge: 4 Weeks To 50 Push-Ups
Workout of the Week: 2 Minute At-Home Fitness Test - Workout Trainer app
The Ultimate 30 Day Push Up Challenge for Beginners
3 20-Minute Squat-Pushup Pyramid Workouts, Fitness
30-Day Pushup Challenge to Build Chest Strength and Endurance
Push Ups World Records
The Push-up System
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Push Up Challenge - Push Ups on the App Store