Lance, welcome to the HSBBWeb. Search the "Strength and Conditioning" forum, you will probably find a treasure of info on the subject of gaining weight and strength, while maintaining OF speed. In the meantime, 102 lbs. ? EAT!
A 13 year old boy has not hit a major growth spurt yet, the weight will come on as you mature. I wouldn't worry about it just yet. Eat what you like, try to learn healthy eating habits, stay active and when you are a bit older and start serious conditioning and playing serious bb, then you can worry about it.
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