son can’t pedal bike, will tricycle be better?

My son will be 4 in a month. He’s healthy and active and can’t play soccer and baseball, so he’s coordinated for his age. My father bought him a bike with training wheels for Christmas. Despite a lot of coaching on my part and a determination on his part (my son) he can’t seem to pedal hard enough to get going. He keeps trying to pedal backwards. I’ve tried showing him the correct way, but he just can’t seem to get it. His birtday is coming up and I thought I’d try to get him a different kind of ride on toy that he could learn to pedal on more easily. Any suggestions? Would a tricycle with a back be easier for him to learn to pedal on?
I just thought the added back stability would give him something to push against. Also, it would be smaller and give him more leverage to pedal.

My little one still has a tricycle, it gets them used to actually pedaling. It’s harder than it looks, or that i remember but there’s something about it that a lot of kids can’t’ get (my older child had a hard time with the bike). The tricycle will give him the support he needs to get the pedals around and being lower to the ground will help gain some confidence in pedaling.

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