I started swimming probably at about 6 I think. Could ride a bike at more like 4

DD1 could ride a bike with training wheels by 2 and DD2 more like 2.5, but TBH neither of them are particularly interested in bikes - they prefer their scooters.

Swimming both my girls have been very early and could swim to the edge of the pool by 2.5 without any form of assistance. Now at 4 and 5 they can swim about 20 metres by themselves unassisted. We have a pool so the swimming thing is something I've really pushed.