Regular skipping is like jogging in place while jumping rope, jump once each rope turn with alternating legs.

Sitting on mat with legs extended and knees slightly bent and holding medicine ball, or other weighted object, close to one hip, raise legs up off ground and hold them a few inches off ground throughout movements. Twist torso to opposite side bringing medicine ball to opposite hip near ground. Continue twisting torso and bringing medicine ball down to alternating sides. Each touch down with medicine ball is one rep.

Lay on mat with knees bent and feet on ground with arms beside you. Then sit up, bending one leg under you and put other foot on ground, using the strength of that leg lift yourself up – try to not use hands for support, and get up to standing. Then reverse movement to lie down again and continue repeating these movements. To modify, use your hands for support to help you get up.

Standing with feet hip width apart, squat down and place hands on ground in front of you, jump legs back into plank position, do a push up and then kick one leg out to opposite side underneath body and as foot comes out reach down with hand on the side closest to it (opposite hand to foot that is kicking) and touch toe as it kicks, bring foot and hand back to plank position and jump legs back in and jump up in the air. Alternate sides for each rep. 

Lie on mat and lift legs together straight up, then using your core muscles lift butt up off the ground keeping legs straight up, then bring arms up and reach to touch fingers to your toes, and then lower legs to start position.This is one rep.