I'm new to this forum. Some backgrounds about me: i've been playing basketball for about 7 years since high school. Mostly just pickup basketball, i was never on a team, so not very physical basketball and no major injury. I used to play for around 3-4 hours/day for 4-5 days/week. So about 1.5 years ago i stopped, not completely, just a lot less than i used to because of work and college (maybe once every 2 weeks), but i still workout 3 days/week. Now at 23, i'm starting to feel some strange fatigue in my right lower back and my right buttock/thigh whenever i run for about 15 mins. My right leg would feel really heavy and tight which was strange because my legs would usually be the last thing to get tired. I can't keep up with anyone once that happen and it would get worse every time i try to run fast. The feeling would lingers for a few hours.
I'm thinking it could be because of weak core muscles but then why is it only happen to my right side and only around my back and butt/thigh area? I have never feel any fatigue on the left side. I'm working part-time as a waiter and usually stand 5-7 hours/day, sometimes 12 but only for 3 days/week. Could this have an effect on my lower back and cause this?