Hi Aaron
Thank you Cindy for jumping in and explaining what I would also have done. As it happens Cindy and I have similar experiences with injured hamstrings which with over working became injured. This meant the yoga didn’t help heal it but actually exacerbated the situation.
It would be remiss of me not to mention that you could simply be practicing these poses with wrong technique. Often what happens in Janushirasana or other poses that use the same kind of pose mechanism is that the student tries so so so hard to straighten their leg before they are ready. The head may or may not be on the knee (usually not on it). So without me simply guessing from a myriad of possibilities, you can help me by answering a couple of questions.
What I would like you to do is firstly tell us which poses exactly are the ones you feel the problem. You can use English or Sanskrit names - go to the Pose Gallery in the Resource Center if you need some help, or the forum main page has them listed too but without photos.
Please also tell us any other information you can think of about what you’re doing and how. Don’t worry if you can’t add details at this stage, as I will ask you questions where needed.
Do you think you have had an injury in your hamstrings? Are there any other times it feels sore or is it only in class?
That’s enough for now!
Namaste
Gabrielle