I understand why "they" say Yoga is so effective!

OMG!! I got 4 new 20 minute yoga dvd's and they are killing me. I do 2 of them every other day and the other 2 the next day doing those every other day as well. I'm so sore but I totally understand why Yoga can be so effective. I really like them but they kick my booty but I feel so much better afterwards!! Have a good week!!