Being a yoga purist might not be doing your body justice. A consistent yoga practice lengthens and strengthens muscles with time, but if you're ready to feel stronger in class now, a little cross-training goes a long way. Challenging your muscles outside of class will help you feel more comfortable and confident in new poses; maybe you'll even feel tough enough to try that Handstand Scorpion someday!
If you're a committed yogi, moving through these exercises might seem a little foreign at first. Trust that they'll only deepen your relationship with the asanas.