Bodyweight movements can take you far. Here are some ways to modify them to be easier or harder:
Push Ups (to make them easier)
-Elevate your hands on a bench, box, or smith machine
-Do only the eccentric portion of the movement(lower down slow), then go to your knees to get back up
-Do long isometric holds at the top (as Dan John calls them, PUPs)
Push Ups (to make them harder)
-Elevate your feet
-Use a band, chains, or plates as an external load
-Vary the speed of your decent (super slow on the way down, pause in the bottom)
-Vary the speed of your ascent (clapping push-ups)
-Add more total reps
Pull Ups (to make them easier)
-Use a band
-Just do the lowering phase (jump up to the bar and lower slowly)
-Have a partner assist you through the sticking point
Pull Ups (to make them harder)
-Use a weight vest or belt with an external load
-Add reps and/or sets
-Change the tempo, grip width, or grip position (palms facing you or facing away)
Bodyweight movements can be useful when traveling, or if you simply need a mental break from other exercises you’ve been doing.