I'm not sure how otherwise to phrase the question in one sentence, so I'll elaborate here: For the last 4-5 years, I've felt gradually less flexible. This period coincides with probably the lowest level of physical activity in my life, except for bouts of weight training (which I'm currently doing and taking seriously). One problem I'm still having though is inflexibility (at least when compared to my youth state) and general stiffness. At times I've blamed it on my celiac disease (it can cause nerve damage), but apart from that I can only imagine it's due to inactivity and/or aging. I'm just 26 however, and can't imagine that age alone should do this yet! While playing around outside with my younger brothers, I skipped across a narrow, elevated plank and slipped off. This sprained my ankle so bad I had trouble (and pain) when walking for several days. At that point I realized something has drastically changed. Compare this to my younger days (I also played organized soccer from 5 to 17ish) - where I could pretty much fall down some stairs twice a day without any lasting issues. More recently I jogged lightly without warming up 'cause I was in a hurry. That caused a sharp sting in my ankle that could have been a sprain if I had stepped just a little bit harder on it. So I guess my question boils down to: Is it likely that my issue stems from inactvity, aging or a mix of both? **PS:** I've seen doctors on several occasions about parts of this issue, and none have concluded that anything's wrong. I'll happily go back if someone suggests it, but for now I just wanna get a general discussion going and hear some experiences. Thanks for reading!