Burpees are one of the best full-body exercises you can do. Start in a standing position and quickly drop down into a push-up position, before jumping back up.
There are many different ways to do a push-up, and depending on your strength level, you can challenge yourself with modifications.
With your feet flat and at shoulder-width apart, squat with your hips moving down and back, like you're sitting in a chair. Keeping your arms extended above your head will help you keep your back as straight as possible.
Lay on your back, with your legs extended and arms behind your head. Bring your opposite knee to meet the opposite elbow, shifting to the other side quickly.
Planks are one of the best core exercises, and they can improve your balance, stability, and posture. To do a basic plank, all you have to do is hold a plank position, staying low to the ground on your forearms.