Yoga is a recovery type of exercise. Unless it is some extreme bastardised yoga in 120 degrees with your heart rate at 90% etc. But traditional yoga should be fairly gentle and not strenuous. I generally do active recovery days, unless my HRV is totally in the red. Simply because I live to get outside and be active. Meaning I might go for a run/walk or a bike ride, or some rowing and keep my heart rate low around 110. Works fine. MY HRV is back in the green the next day and ready for a good workout. Oh, and I do yoga 3 times a week, and do not even count it as a "workout" but more of a healing treat for my body. Listening to Hams about fitness or diet is like listening to financial advise from a homeless person living under the freeway.