2. Bird-dog
This exercise makes your abs, lower back, glutes, and thighs stronger.
Step-by-step: Kneel with your knees hip-width apart and your hands shoulder-width apart on the ground. Lift one hand and knee off the ground and balance on the other hand and knee to keep your weight in the middle.
Stretch your arm straight out in front of you and your other leg straight out behind you. Keep your hands and feet in a straight line. Hold for a few seconds, then go back to where you started and do the same thing on the other side.