Stamina is through the roof, current PR's havent been tested and I dont believe they are at the levles I was 20lbs ago on hella, but stamina is very close, have no problem throwing around weight I was before...its a great feeling when the weights start to feel light. I will say, I started each product at a separate time, LGD first, S-4, then GW...the 3 combined blow a single run out of the water. I noticed nice gains when I was running them solo, but the addition of them together is awesome. I am almost out of s-4 and will be running Epi for another 4-6 weeks when that happend, LGD will continue for another 4-6 weeks and GW will be another 4