People who have never done yoga before often mistakingly think that yoga is simply stretching, and that there's only one kind of yoga. But yoga is so much more than making your body all Gumby-like. There are many different disciplines of yoga, each designed with a different goal in mind (vinyasa, or power yoga, is about working up a sweat through fast yoga flow, while hatha yoga is about meditation).
And there is a different type of yoga flow you can do for different needs. So if you're feeling lackluster and tired and need to renergize yourself, check out this yoga flow for energizing yoga movements.
Energize with this yoga routine from Tara Stiles designed to balance and strengthen your body and mind.