When I do the Tuck Up, at the point where I'm standing back up, I get loud cracking noises from my left knee. The noises are not singular, but more akin to crunching some paper. There is no pain, fortunately.
I have tried these with my knees and feet together, apart, angled, etc., and in all cases the cracking happens. However, when I get up from a stationary squat, there is no noise. Quite odd.
In the past I've had some reactive arthritis issues, where that knee would swell. Xrays showed no bone issues though.
So, should I be concerned about the noises?
