Went a nice wee walk today with my better half , we went up Eglington park where a bcuk wee meetup was before ,Anyway the tower was open and people were up so we decided on a nice view i had,nt been up since i was a kid !Climbed all the spiral stairs quite quickly and had a normal wee burn in the thighs ,we stood up top and admired the view for a while before heading down which was easy.However when we started walking n the flat my left leg was having what felt like the most lactic acid i have ever had x 10 while the right leg felt fine very strange, so strange i had to go and sit down which made it feel slightly better but when i wlak i have this burn all over my leg there is no pain or visible signs of injury never had this before any ideas ?