The lunge is a brilliant exercise, helping you to develop coordination, balance, and the unilateral (one-sided) functional strength of your lower body.
If you don't have access to a leg curl machine, try the inverse leg curl on lat pull-down machine, an isolated pull exercise that targets your hamstrings.
Use the frog crunch with leg raise, a compound core exercise, to activate and strengthen both your abdomen and hip flexors.
The decline crunch is an isolated pull exercise that targets your rectus abdominis. Your internal and external obliques act as synergists.
The superman push-up is an advanced bodyweight exercise that’s great for strengthening your core. Do not use it if you can't keep your core tight.
The bent-knee oblique v-up is an intermediate core exercise that targets the obliques and synergistically works several other core and leg muscles.
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.