Is yoga just enough for your health ?
This question will be lingering in everyones mind who starts to do yogasanas. If they go to gyms regularly, then for sure this question will be asked to the trainer or to the yoga-instructor.
Well heres my take on this question (From all the readings done on this topic). Ideally, yoga is just enough or even more than enough if you practice regularly for an hour. There has been experiments conducted on endurability/health of heart/lungs/stamina on person who just did yoga and he very well matched or was even better than people who just did exercises.
But, for normal/regular people like us (who doesnt do yoga daily, as recommended), exercises can also be as part of our routine. It adds up variety and sure brings up results quicker than yoga alone. (If you have a very slabby stomach and needs 6pack (not beer!) just yoga alone maynot help you get the results faster.
Ofcourse proper diet is required (no questions about that).
But I always recommend this in my classes. Dont think yoga as an workout. Dont think yoga as a tool to sculpt your body. Those are extra benefits you get if you do asanas. The real benefit is the stress relief, healthy/relaxed mind goaled towards eternal happiness.
Also I recommend not to do regular workouts immediately after or before your yoga session. Try to keep them several hours apart (like one in the evening and the other in the morning)

I can hear you say "Well, who has time for both!". I agree with that :-)