Do you think you can attribute the relaxation more to the breathing or stretching component?
I've been doing casual meditation (mostly just mindful breathing) and I wonder if I'd further benefit my mind from Yoga. I already do intense cardio and resistance exercises from other activities.
The stretching to be honest. I used to meditate, but these days I only really do it I can't fall asleep, or need to fast forward my brain getting over some bad experience I've had. For a productivity boost, I'd definitely go with yoga for more 'bang for your buck' per say; I'm probably on the mat for roughly 5-10 mins, a couple of times a day or more (depending on frustration levels!)
Intense exercise is also good, but it gives a different result than Yoga, seeing as you are pushing yourself to the limit. Yoga is more about calming your body, centering yourself, getting the immune system moving and so on.
I've been doing casual meditation (mostly just mindful breathing) and I wonder if I'd further benefit my mind from Yoga. I already do intense cardio and resistance exercises from other activities.