My son just turned 4 in may, and he is SO resistant of pooping in the potty, and we have tried EVERYTHING under the sun to get him to go in the toilet, but he just wont go. I know he can control it, because he wont poop anywhere but at home, in a pullup. He goes pee totally fine in the potty though, but I just started him off standing from the start, I had him watch his dad, but even though he sees me & his big sister going pee & poop on the potty, he dosent watch daddy to much since he works midnights, so hes being potty trained pretty much by women, lol. I feel like no matter what I try, he just wont go poop on the toilet. Im at a loss as well, and espically concerned since he starts pre-k in the fall. we do pullups only at night, and even with those on, he stays dry most times, and even gets up to pee in the miggle of the night, suprisingly! its just the pooping issue we cant master, so im sorry but i dont have any suggestions for that. we tried the stickers chart, which worked for the pee. plus we let him 'water the trees' outside in the summertime, because he gets so involved in play he forgets to go, and when we remind him he gets mad because hes kind of wet but not too much. he likes to pee outside so maybe that could be a start for your son when your outside. or let him go without anything on int he house, no pants or undies so its easier for him to get there faster without having to mess with a diaper/pullup. good luck, i can totally relate :)
pullups at nite is great underpants in the is very good after he eats or while playing hav him go 2 the potty or bathrm giving prizes very good