Originally Posted by hillcrawler

Lay down on the ground on your back and try to make a 90 degree angle by lifting your legs (one by one of course).

I fail this test as I can make only a 60 degree angle with my left leg while I can lift my right leg almost straight.

Is it due to tight hamstrings do you think? Or some gluteal muscles? How do you think I can correct this and make both legs equally flexible?
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P.s. I don't ride for about five years due to some patellafemoral syndrome. I wonder if it has to do anything with this and maybe I can ride again if I can correct this.