I'm in my mid-thirties, and have been cycling for about ten years now (with some amateur races mixed in). I ran some in high school, and have started running more. I'm up to about three days a week, but after about a month of doing that I developed a strain in the lower part of my right hamstring. Took about a week off (still cycled some), did an easy 20 minute test run yesterday (it felt fine), but then the problem occurred again during tonight's run after about three miles.

Besides getting better with consistently stretching, and incorporating some weight exercises to strengthen my hamstring (I'm thinking it's likely weaker than my quads from cycling and that's causing the injury), is there anything else I should try or am not aware of?

Anyone experience something similar and have some advice? Thanks in advance.