My 7 year old son told me the other day that he wants to exercise and get strong "like Mommy." So we started a journal for him and listed the exercises that I do and have started working with him on proper movements not so much on repititions or weight. Wanting to get the propper movement down so he doesn't hurt himself. We work out at hime with my hand weights and body weight.
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Due to his age he lacks coordination and I lack patience. He wants to work out with me but I told him that until he can manage the moves properly without flopping around we have to work out seperatly so I can help him.

I googled children strength training and its said that its good for them as long as its for strength and not to bulk up due to growth plates. They also recomended a trainer but thats not cheap and I can't even afford one for me so I get the fun of teaching him. I'm doing my best but on some I feel like he is either bored, not listening or i'm not explaining it to him correctly. My oldest son 15 helps with demonstating proper form (his coach would be proud of him), so I can help hold my son steady and try to get the moves done correctly. He's only working with 2-3 lb weights but he wants to kinda flop them around and same with lower body strenth, he just wants to bounch around, not a care to propper form. I'm sure at his age its not important but I don't want him hurting himself.

Right now we are working on learning proper form, he says he has no muscle soreness the day after.

What can I do to help this along? I don't always have all the patience in the world and him being 7 he doesn't always have the best resolve in the world