Sis just recently figured out that the jumperoo is for jumping and fun, not for "hanging there baby torture." The little princess has not shown any interest in putting any weight on her legs (she has been checked out and is fine - just not interested.) So when she finally began to give tentative little hops in the jumper, she got lots of enthusiastic praise from whoever was closest (Good Girl!!!). Now that she is a pro jumper, she tends to jump for awhile and then wait for encouragement which she takes as her cue to go nuts until she has to stop for more encouragement. She has been getting some serious air over the last few days!