One way to strenghten hands and wrists, is to
1)extend your arms out in front of you
2)turn your palms away from you, fingers up
3)fully open your fingers
4)make a super tight fist.
the idea is to repeat #3  as fast as you can, so you open, close, open, close for atleast a minute. count the number of times you open in that minutre. the trick is to get faster as time goes by.
sounds useless.. well give it a go, if you do it as fast as you can it should burn like a bitch. dont reccomend doing it before a killer workout. try at night before bed or when your feet hit the floor in the morning.
this will increase your grip over time. as hey, its Shaolin, and sure beats sand.