The bodyweight squat is great for learning the very basics of squat form, such as how to keep your head up and torso upright as you descend.
The inverse leg curl (aka bodyweight or Nordic hamstring curl) is useful for working your hamstrings in the absence of a leg-curling machine.
Use the stability ball leg curl to work your hamstrings in the absence of a leg-curling machine. To make it more difficult, perform it with one leg.
Use the side plank hip abduction to build your outer thighs, work your core, and strengthen the lateral flexion movement pattern of your spine.
The side-lying biceps bodyweight curl is a poor exercise. However, it can help you to work your biceps in the absence of dumbbells and barbells.
Use the kneeling bodyweight triceps extension to isolate your triceps brachii in the absence of dumbbells, barbells, and weight machines.
The side plank hip adduction is a decent exercise that you can use at home to strengthen your core and work your inner thighs.
The elbow lift is a poor exercise. Use it only if you do not have the resources to do better, more effective back exercises, such as the barbell row.
The biceps leg curl is a poor exercise, with a limited range of motion. Use it only as a last resort if you do not have anything else to curl.
The one-arm towel row is a bodyweight exercise that you can use if you can’t make it to the gym and do not have access to dumbbells or a barbell.
The lying single straight-leg hip extension is not an effective exercise for overloading your hamstrings. Use it only when you do not have access to a gym.
Use the spiderman push-up, a compound push exercise, to improve your balance and coordination, and build upper-body and core strength.