I started using one with Emerson around the same age as he was rather strong as well. I always make sure he is flat footed and he goes in until he gets grumpy - anywhere up to 1/2 an hour.

OT here but...

Shannon ~ Emerson sounds like he is taking after your Zianna!

Kim ~ Em only turns around too no matter how much I try to get him to jump LOL!

Enigma ~ OMG look at Aneta in your ticker! She has grown so much and she is gorgeous!!