You know, I remember reading somewhere that historically, the strongest men were the guys who did whole-body, hard work. This was, like, blackmsiths and ploughmen.

Having a mess of fancy-pants equipment is all well and good, but honestly, moving and throwing heavy, simple stuff, if you do it a lot, is going to get you strong. Bags of chicken food or sand...logs and big rocks....do squats, throw the things, heft them all up over your head until you're tired....do a bazillion push-ups and sit ups. THROW BIG ROCKS. It's all good.

Source for potential heavy, large objects to attach handles to and heave...

old brake drums from scrapped cars is my favorite.
Go to swap meets and garage sales and see if you can find somebody getting rid of an old anvil or a sledgehammer.

go down to the auto tire shop and see if the guys will give you their old tire balancing weights. Find a junker steel coffee can and a galvanized eye bolt. If you can find a totally cheap pot in which to melt the lead weights, all the better. Try thrift stores. Melt the lead tire weights in a pot, on the kitchen stove or better...on a camping stove (outside) and pour it into the coffee can. Stick the galvanized eye bolt in there before the lead cools and hardens...leave the nut and the washer on the eye bolt. When it hardens, voila...you have a weight for height and distance for the total cost of one galvanized eye bolt...about five dollars. Add a galvanized ring and a quick-link and you're good to go.

Probably the drop-dead easiest practice implement to make is a pud.

To make a pud, get about 2 1/2 feet of reasonably strong rope. Thread it through a 8-inch piece of galvanized pipe. The pipe is gonna be your handle. Now thread it through two ten-pound, or four five-pound weights and tie the loop closed. Go throw it around until you wear through the rope. Replace rope and repeat.

Can't find weights? use an old junker car brake drum. The flywheel off an old engine make a GREAT general "heave it around" weight.

Remember, lifting weights gets you strong, but throwing a LOT gets you throwing far.

for stones...drive down to the river in the summer and find a nice one. Go smash grass with it.