medicine ball

specification:
1.a great tool for workout
2.strengthen shoulders,back,arms,and legs
3.main material:rubber
4.size 1/2/3/4/5/6/7/8/9/10kg 2/4/6/8/10/12/14/16/18/20lb

medicine ball is firstly used to help people recover from an arm operation. now it is used to exercise your arm and abdomen muscle. medicine ball is quite easy and convenient for personal use, and it wont take much space. you can exercise it wherever you want, and also you can pass it to each other to exercise.