This is for my wife. I'd like for us to ride together at least a little, but when she exercises she get tired. I mean REALLY tired. Fall asleep standing up tired. She can be active for long periods without a problem, but if she gets her heart rate up its all over. It's pretty flat here but if we climb one hill (false flat) she can pass out at the "crest".

She has some other health issues such as asthma but it doesn't have a chance to kick in before she's out.

Any suggestions about what she can do to address this?

See a physician and make sure there's no underlying problem.

keep goin at it, make sure she's not drinking gatorade or anything with loads of sugar. Nutrition may be the problem here.

I drink cytomax and heed, still a bit of sugar in the cytomax, but i don't bonk after a ride and i feel GREAT

ps- good luck to you and her, i've been working on mine but no budge.

+1000 thats just not normal. See a doctor!

My wife can swim a mile in record time. Put her on a bike and my grandmother can beat her. Personally, I attribute it to sport preference.