My son does a three times a week speed, strength and agility program. He also hits indoors twice a week. He has an indoor pitching lesson once a week. He's not throwing full throttle. It's more about mechanics.
My son is a junior in high school. In looking at your other post, a thirteen year old should have fun playing other sports. If you can't make a middle school team play in a rec league. A 102 pound kid shouldn't put himself through such a vigorous workout routine he damages growth plates.
Be patient. When my son was thirteen he was 5'2, 110. Now he's 6'1", 175. He played basketball in the winter. He didn't touch baseball equipment from August until March.
It isn't the end all be all but could be a cheap way for you to workout in your home and build up your core, arms, shoulders and back.
Look up and research kettlebell workouts (lots of them on youtube) and get yourself one. Easy to do, low cost ($50 or so at sports authority for a kettlebell)and needs little room.
There are lots of good things you can do that require little to no special equipment. IF you have a few dollars to spend (roughly $30), a great things you can do is buy an Iron Gym (or simlar). This can be found in lots of stores.
Here is a series of exercises my son's Coach has him doing that are really strengthening his core:
Pull-Ups (knees bent so feet don't touch the floor)
Vertical Crunches (Holding your body up in the pull-up position on the narrow grip, with knees bent so feet don't touch the floor)
Straight Crunches (lifting knees to chest) - 10 reps Side Winders (crunch, lifting heels to side, knees turn to side) - 10 right, 10 left Stretch Position (lifting right knee towards left shoulder, rotating to show "back pocket" to a hitter; followed by left knne to right shoulder) - 10 right, 10 left
Add in some Push-Ups, Prone Holds, Side Ups and Supermans, and you have a good 360 degree core workout.
Let us know if this helps.
PS -- I agree with the earlier comment ... shovel. If you're smart about it, you can get your neighbors to pay you to get conditioning; then use some of the money to buy an Iron Gym.
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