Not been running a lot recently (only about one run a week but been doing lots of yoga) but each time I do, I get a generalised pain and stiffness in my right leg. Did a gentle 3k tonight and the said leg was fine when running but as soon as I stopped my whole leg seized up into a kind of spasm. It has been feeling weak and stiff for a few weeks now. Thought running would loosen it up and it did a big warm up before I went out. Tried different trainers but this didn't help. Nothing hurts if I press it but the pain seems to radiate up my outer calf, ankle, knee area and groin. Any idea what the heck this is and what should I do? I really want to get going again and build up to 3x30 mins a week but at the mo I feel like an old crock!