Summer camps were instrumental to my development and have been very beneficial to many wrestlers for the past few decades. Do your research to find the right camp. Unfortunately, there are many sub-par camps, so you want to make sure you get a great value for your investment of time, money and energy. Sportsmanship is the key to any true athlete. Do not overtrain.
Rest is very important in maintaining and building strength.
Do box jumps to improve the strength in your legs and your speed. Use a wooden box or any other sturdy platform that stands about 1 to 2 feet off the ground. Jump onto the box or platform and immediately off of the opposite side. Repeat this going side to side. Box jumps improve quickness as well as power in the legs.