If you’re gonna talk about bike riding, then what about horseback riding? Please don’t say that’s wrong! I’d never be able to give that up!
Ames, rollerblading can be tzniusdig or not. Bike or horseback riding on the other hand…watch someone pass you on a bike or watch them bobbing up and down on the horse and draw your own conclusions (not saying I disapprove of either, but compared to that rollerblades are nothing).