I can do a hundred normal squats pretty easily, but my knees hurt after. I think if I tried Hindu squats, my knees would explode.
If you're getting winded, you need cardio. Find the proper range to which you should elevate your heart rate (talk to your doctor about this), and choose an activity that gets your heart rate there and keeps it there for at least 20 minutes (again, talk to your doctor).
The general guideline is that it takes 2 times a week to maintain cardio, and 3 or more to improve. Remember to warm up and cool down.
Of course, one of the great things about this is that hiking is generally pretty good cardio. If you want to elevate your heart rate, select a hillier trail than usual, and keep up your pace on it. You can do, say, a half hour of hills, then switch onto a more flat path and stroll at a more relaxed pace.