MTN Ops is an excellent nutrition company, love how involved they are with their product and overall trying to help everyone with their well-being, both physical, mental & spiritual. YETI is what I use for my circuit training workouts, great energy rush, no sugar crash. I have used it for over a year and definitely feel the results. At first I could feel the beta-alanine burn on my ears 15 minutes after taking it, but my body has built up a tolerance for it.