My little man is almost 7 months and has SUPER strong legs but he doesn’t have much arm strength.

When on his tummy he’ll push up with his forearms still on the mat and can’t push up just onto his hands. I’ve tried putting him in the position and supporting him but he can literally last 1-2 seconds before he can’t hold the position any longer.

Any tips on building up his arm strength other than just tummy time as he isn’t interested AT ALL in even trying to push all the way up!!