Yoga Exhaustion

Ok... so I've been doing yoga daily for almost a week and I feel exhausted. Who knew stretching was so tiring?! Different parts of my body are taking it in turns to give me gyp. Luckily it turns out there is plenty of yoga designed for people with low energy; I've tried 'Gentle Hatha Yoga' and today (if I don't feel better) I'll be moving onto Yin Yoga. YogaDownload podcasts are a lifesaver here... the calm voice of yogi pushing me through a class when, if left to me, I'd probably quit after 10 mins in favour of sitting on the sofa eating wasabi peas and watching fashion police.