Can people with asthma exercise

That depends, and you should absolutely talk to your doctor about this!

I don't know what kind of Asthma you have, I don't know what your triggers are, and all I can do is speculate.

If you don't have exercise induced asthma, then you should be fine so long as you're not exercising in an environment that has your asthma trigger.

If you do have exercise induced asthma or would be exercising in an area where an asthma trigger would be present - prophylaxis would be indicated.

Prophylaxis is pre-emptively treating the disorder before it happens. In this case you would either use a rescue inhaler BEFORE exercising or you would start using a daily asthma medicine to help control your attacks.

Again, talk to your doctor because he will better understand the severity and full nature of your condition!