First of all, let me say that it's soooo nice to have Squinge's Mods back at Insim! I really missed you, dude!
Secondly, I would like to respectfully suggest a mod that would allow toddlers to gain body skill (and fitness enthusiasm, if possible) from riding the Bouncy Bork Spring Rider that came with the other playground equipment in Apartment Life. Have you seen one of the little beggers ridding the bouncing llama? Those little rugrats are working hard!
After all, the children are gaining fitness from the monkey bars, slide, and climbing tower . . . it's only fair that there should be something in it for toddlers too!