Two effective abdominal exercises you can do at home are the bridge opposite arm-leg reach and donkey kickbacks. Use a yoga mat, towel or floor pad to make doing the exercises more comfortable.
To do the bridge opposite arm-leg reach, lie on the floor face-up, with your left knee bent and left foot flat on the floor. Extend your right leg upwards toward the ceiling. Using your left arm, reach towards the ceiling while keeping your right arm firmly at your side. Keep you hips and shoulders still and move your raised leg to the right and raised arm to the left. Focus on your abs and return your arm and leg to the center. Repeat this exercise 10 to 12 time, then switch sides.
To do a donkey kickback, kneel on all fours with your toes tucked underneath. Next, pull your stomach in towards your spine as you contract your abdomen. While your abdomen is contracted, lift both knees two inches off the ground and bring your right knee to your nose. Kick your right leg straight out behind you while squeezing your butt muscles. To protect your back and maximize the efficiency of the exercise, keep your lower abdomen contracted and your hips facing the ground. Repeat this exercise eight times, then switch legs and repeat.