An advantage for us is probably cuz we met through aikido. He's
my senior and training together is like second nature to us. I'm
quite interested in self defense also so he shows me basic
grappling and lets me try. For swimming, both of us swim relatively
well and he likes to swim. I think most impt is that the sport you
wanna do should be a common interest.
For example, I skate but he has a bad sense of balance and finds
it difficult so we don't skate. If both are comfortable and at
similar level of proficiency then can try out. Or else one of the
two will feel pek cek...
okay, that is a good suggestion. Thank you so much!! 
now let me think what common interest in sports do we have..
hmm! 
The first thing that it come to my mind is... eating 
we
both are food lovers.
sports wise... it's kinda hard.. 
maybe
one weekend, i should try badminton or something...
wow~ now it's really making me think real hard.
