Here is some info from my wife, hope it helps
A yoga class ideally should include a balance of all asanas; (Sanskrit for postures) standing, balance, seated, prone and supine. It should also include a pranayama (breath control) practice. I know it is ideal to keep the heart rate low, and I often wonder how athletes going about this? Pranayama teaches to use the full capacity of the lungs. Many of us are chest breathers and never breathe deep into the belly, let alone into the back body. We often forget that the lungs expand 360 degrees around. There should be some sort of additional breath practice being taught in addition 3 part breath and/or ujjayi which are usually done during the asana practice. Breathing, can help to either calm or excite the entire nervous system. So when the breath becomes irregular and unsteady, the mental state also becomes unsteady. However, when the breath is calm and steady, so is the mind. This leads me into the final pose of yoga practices…savasana (corpse pose). My students always laugh when I tell them this is one of the most difficult postures in the entire practice. Savasana, is about being still in both the body and the mind. From an athlete’s perspective, you might look at savasana as your recovery time. You have done all of these postures…strenuous or not…and savasana is your time to allow it to integrate. Ideally, your breath practice; usually nadi shodhana, (alternate nostril breathing) would come after your asana practice to prepare you for meditation. Regardless of your religion or creed, this too is an important part of training. So much of training is dynamic and taking the time to sit and get quiet creates balance. It also teaches concentration and focus…which last I checked was a big part of racing 
For those who mentioned reducing problems with fascia, you might look into taking a yin yoga class. Yin holds postures for about 3 minutes with the muscles relaxed in order to work the connective tissue. Restorative postures are usually included in this class as well.
Those of you who enjoy restorative classes…I don’t blame you! They’re lovely! In a restorative class, you are fully supported by blankets/bolsters/blocks etc. So many of us don’t give ourselves permission to slow down. If you can get to a restorative class I definitely recommend it…as long as it is at least an hour and a half long. That’s my opinion.
I can’t remember the person who mentioned “inconsistencies between instructors” at the gym, but I thought this was an interesting word to use. No two classes will ever be the same. Chances are if you take a vinyasa class at 2 different studios they will be nothing alike. Just because the class may have the same name, the instructors will teach differently. This is primarily do to the training (or lack of) they have received. To locate a reputable teacher in your area, it is best to go to the Yoga Alliance website at www.yogaalliance.org They set the standards for us. The teachers listed on the Yoga Alliance website have attended a credible school and are required to fulfill continuing education requirements as well.
Finally, always tell your instructor of any chronic or acute injuries, un-medicated high blood pressure or eye disease. Also be sure to mention any medications you might be currently taking. We want you and others in the class to be safe and can only create that environment if you provide the information.
Hope this was somewhat helpful!
Shannon Clark, RYT