Keep your whole body straight parallel with the floor

Exercise 2: Exercise with a basketball

Keep your stomach and feet far from the floor 

Lift up your body and still keep the ball standstill on the floor

Turn back to the first position  

Move the ball to the other side and practice again 

Exercise 3: Exercise with a crossbar and a ball

Lay your shoulder on the ball, keep the whole body parallel with the floor, and hold the crossbar like in the picture 

Rise up the crossbar 

Turn back to the initial position  

Exercise 4: Exercise with dumbbell and a ball

Raise your arms up like the picture

Fold your arms 

Turn back to the initial position