I first used IGNITE on a seven day elk hunt in AZ. It worked great. I hiked up and down hills and walked an around 18 miles a day. I could feel a difference in my cardio performance when I used IGNITE. On up hill portions my heart rate was lower and hill top recovery faster. I later did a week long coues deer hunt and the first half I did not have any IGNITE but the second half I used IGNITE and saw an immediate improvement to my cardio. I have been recommending this product to everyone. It has replaced coffee as my morning wake up drink.