just this week i went back to karate after about 3 weeks of not training. I did proper warm ups and a warm down although this following week i havent been able to participate in lessons as all my muscles are to painful mostly my legs. I think it was proberably because of jumping bach into a harsh training routine after not stretching for 3 weeks. I normally a flexible person who finds stretches like the side splits no problem, but at the moment i cant go past my knee height when trying to touch my toes.

This has happened to me once before in the past that i can remeber of.

Has anyone else experienced this, if so how often and why.

Also is there anything i can do to help my muscles get back to norm quicker. eg light stretching or oils etc.