Pull up and push ups are classic bodyweight exercises that are often lumped together, despite the fact that they're quite different in muscle recruitment.
Pull Up vs Push Up: What's the Difference? - Inspire US
How to Do a Pullup: Tips on Proper Form for Men - Men's Journal
Push Up Variations for Workouts - Different Types of Push Ups
Pull Up vs Push Up: What's the Difference? - Inspire US
How to Master the Push-Up - The New York Times
Best Workout Split, Workout Splits Guide
Which is better push ups or pull ups? - Quora
How to Do a Pullup: Tips on Proper Form for Men - Men's Journal
Pull-Ups vs. Push-Ups