Hi there
The activities tab here is a great place to start - or check the What's On calendar.
Sounds like your son is already pretty active, but if you were interested in gymnastics classes, we run age-appropriate, fun classes at The Little Gym in Wandsworth, 5 mins walk from the high street. We have a large, purpose built gym and our fully qualified instructors teach weekly classes. Your son would be one of our Beasts (19 to 30 months) and we have 9 classes for this age group each week, including Saturday and Sunday mornings.
Please do have a look at our website
www.thelittlegym.co.uk/wandsworthfulham or give us a call on 0208 874 6567 if you would like to learn more. We offer a free trial so you can see if your son is going to like it.
Good luck finding something for him.
All the best