I recommend the exercises in this article, of which there are one - wrist curls. You basically do one all out set of wrist curls to 50 reps, bump up the weight, rinse and repeat.
http://chaosandpain.blogspot.com/2010/08...f725fea5e0
http://chaosandpain.blogspot.com/2010/08...f725fea5e0
“I have a very simple rule when it comes to management: hire the best people from your competitors, pay them more than they were earning, and give them bonuses and incentives based on their performance. That’s how you build a first-class operation.”
― Donald J. Trump
If you want some PDF's on bodyweight exercise with little to no equipment, send me a PM and I'll get back to you as soon as possible.