Our gym has a rock climbing wall. You must be 4 yrs old to go climbing. Sean has been waiting and waiting til his 4th Birthday, to try the wall. He's done a few small ones on playgrounds.. but this one is TALL(maybe 40 feet)... and much harder. The rock pegs, or whatever they are called, are much smaller and NOT easy to get a footing or grip on, and I know... I tried! Since this first day, he has been back several times and it getting MUCH better. Too bad he's not wearing shorts, to show off his SWEET calves!