I don't think that toddler should be in the gym at all! There are bleeping loose weights everywhere! We have a gym in our house too, and a similar age toddler, and neither of us even attempt to work out with him in there. When he is in there he makes a beeline for the weights and tries to touch them, and it's dangerous, they might fall on him. I haven't even had a second thought about 'role modelling' ridiculous gym workouts. Surely promoting a healthy lifestyle, with playing games and sports, and walking outdoors, would be a much healthier (and safer) thing to 'role model'? And definitely not at the age of 21 months, at that age they don't have a clue!