Stand with legs shoulder width apart and squat down so that thighs are parallel with ground and then come back up to standing. Throughout the movement keep weight on the heel of the foot. Make sure that your knee never goes beyond toe. Most of your weight will be in back, so lean forward or reach out arms to counter the weight.

From standing with feet shoulder width apart, holding sandbag behind you high on upper back, holding handles just over your shoulders, squat down so that thighs come parallel with ground and then come up to standing. Repeat squats while holding onto sandbag over shoulders. Each squat is one rep.

From standing, jump legs out and squat down simultaneously touching ground with fingers while in squat, then jump feet back in and stand up. 

Lying on mat with legs flat on ground and arms outstretched overhead near ground, lift one leg and both arms simultaneously, touch toe and then return arms and leg back down to ground and repeat lifting the opposite leg and alternate legs for each rep. 

Sit on mat with knees bent and feet on the floor and then lay back with shoulders on floor. This is your start position. Keeping legs in the same position throughout all movements,  lift up torso using abs and upper body and come up to sitting position and touch ground near feet. Then lower upper body back down to ground and continue these movements sitting and lowering back upper body. 

Start with feet up on ball, hands on floor, and roll ball in towards you bending knees and then back out, at this point do a push up. Continue repeating these movements doing as many reps as you can in the time period. Each push up counts as one rep.

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