Stamina Question

[Guitar Guy]

Hello,

I've looked at this site for a while now and it is a great one! A quick intro...

I'm 21 and I've been with my girlfriend now who is 2 years younger than me for 2.5 years now. We'd started having (safe) sex earlier this year. I'm one to be responsible so I'm always using a condom and she is on the pill. We have great sex at least once a week. So far we've tried only a few positions and we've mainly stuck with missionary. My question for this post is this.

I'm a guy who doesn't have that much muscle on him and can't gain much weight either. Sometimes when I'm on top and nearly climaxing, I feel like I'm about to fall over cuz I can't keep myself up. What are ways I can exercise to keep up my upper body and not fall over during sex? I'm also an asthmatic so I'm usually doing my inhaler a few times as well after sex to stop wheezing and gain my breath back.

[Brandye]

Any of the normal upper body strengthening exercises. Pushups, various arm machines.