Feeling very bummed -- contrary to popular belief that this is impossible -- I have indeed forgotten how to ride a bike. Anyone who has learnt/re-learnt swimming or riding a bike *as an adult* care to share me how you did it?
Never re-learnt it, but remember learning it a first time. Felt the most important things were: 1. Have someone you trust with you to help guide / give feedback. 2. Be in a place you feel safe / can focus on learning the thing. 3. Give it some time.