I am 35 year old long distance runner. I took Hornet Juice for my 2 workouts, one for trying impact on endurance and second one for trying impact on speed. Sensation was different right away, I felt stronger right from the start. I was going on hilly 15 miles long training and it was incredible, keeping strong pace without problems and with lower heartbeat, like never before. And the second one was 2 mile race, I did not notice so great effect at the maximum speed, but nevertheless the very good race and with minimum sign of fatigue the other day in both cases.