Regarding athletic ability:
If this medicine works for you that's great! If you get the side effects though, you'll be on the bench for a very long time. There are reports of joggers and people who suffer athletic debilitation from this drug. I was an otherwise healthy jogger for 15 years except for hbp, now have much trouble due to stamina/energy and breathing related problems. On the good side, the arm and leg muscles seem to be fine.
Regarding fatigue and malaise:
I took the lisinopril for 3 months and suffered for over a year from what can be described as abnormal fatigue and malaise, plus the cough. I recovered to a point, but every time I'd try to start jogging again, I'd have some kind of relapse. Lots of pain in the lungs, shortness of breath, pain in the liver, headaches, flu-like symptoms, feeling off or not altogether here. It wasn't until I found zinc that I recoverery restarted. Zinc, zinc, zinc, a bit of manganse, and vitamin-B. Tried several zincs, and found I like Country Life "Target Mins" Zinc 50mg; I take about 1 a day, though split it to spread it out. I take a 1/4 tablet whenever I feel shortness of breath or pain in my lungs, quite helpful. Note the UL (upper limit recommendations) for zinc is about 40mg/day though I think this applies more to people who are not suffering from mineral depletion. (Note that zinc depletion is a know problem with the general ACE class of drugs.)
Regarding staying on this drug:
Be very wary, as sometimes the symptoms and side effects can take a long time to show up. Many people who had no problems for a long while (years even) seem to report problems after a change in brand, especially to generic, or a change in dosage, either up or down! If you get the symptoms reported here, they will persist for a very long time even if you quit. Further, your doctors will try to convince you that 1) there is really nothing wrong with you, 2) it couldn't possibly be the lisinopril, and 3) if you continue to complain it must be psychological (and so you need more drugs, not less!)
Also please note that on this website there are over 40 pages of complaints about this drug. There ought to be a FAQ (frequently asked questions) or summary. It can be a bear to read through all of them, but until the website improves folks wanting more info should page through them...