To do push-ups with proper form, make sure your abs, glutes, and thighs are engaged. Get your head lined up with your spine and look at a spot on the floor somewhere between your hands. Keep your forearms as vertical as you can throughout the pushup, and make sure you stay within a controllable, pain-free range of motion. If you have wrist mobility issues, make sure you improve your mobility so you can do a full push-up safely! As you get more advanced at push-ups, you can work on asymmetrical push-ups, push-ups with rotations, and any other variation you can think of!