First off, sorry if this is in the wrong section. There seem to be so many sections, that I have no idea where this should go.
I recently started riding to lose some weight, which has been successful up until 20 pounds. I've cut most of the bad foods out of my diet, including cutting back significantly on diet sodas and upping my water intake.
Initially I was riding a stationary bike, a Vital Fitness RB26S. (It was cheap at a yard sale). I started off doing 15 minutes, taking a break, and then doing 15 more minutes. Within the month, I was able to do an hour at a time. Then, my performance started to decrease rapidly. My knees get fatigued and sore too quickly to do 15 minutes on the bike anymore. I don't know if the seat is incorrectly positioned. It slides along a horizontal axis, and cannot be raised. I guess it would fit the profile of a recumbent more than anything else.
A couple of questions:
What can I do to decrease the rate of fatigue I experience, specifically for my knees? How would I determine the proper seat position? Any specific foods or nutrients that might help?