You are the reason

Seriously giving u a reason why u should learn riding while u still can -
http://www.youtube.com/watch?v=SpLXx8Jogzs


otherwise ...

To be fair, there are actually many interesting things to try in Singapore.

For example join a group of friends for a session of night time kite flying where you will be flying a remote-control kite that is decorated with beautiful LED lights. Check out http://www.goflykite.com/

Or perhaps go skate and savor food with people from http://www.meetup.com/Urban-Inline-Skating/
Their cool inline skates: http://skatewlights.blogspot.sg/

Or join the group that perform choreographed stunt kite flying weekly at East Coast Park and Marina Bay Sand. (I don't know their web link)

There is another interesting group which I find interesting. Check them out at
https://www.facebook.com/thewheelies

Find something that suit your current health condition!