Hello,

I'm not sure if this is the right forum to post in, but I figured some people must have gone through something similar and have some advice.

I recently decided to get back in shape and to start, got a stationary recumbent bike. I've been using it for a few months, 3 times per week for 30 minutes, doing intervals. When I first started, my quads burned (between the mid upper thigh and the knee on the direct top, not the side). I thought this would get better in time as I built the muscle. However, if anything, it's getting worse. My intervals are getting shorter and shorter in terms of how I can push it before it really burns (like 30 seconds or less). Then I subside and the burning dissipates. There's no lasting pain or problems after the biking is finished, but it is a lot of discomfort at the time and it doesn't seem to be improving.

Any ideas for what could be happening and how I could address it? I'd really appreciate it!