I find that I'm usually 10-15% down before I start blasting. But I don't necessarily attribute that to the lack of AAS. I attribute much of that to the fact that I don't bang very heavy during that rehab/prehab period. Powerlifting and strongman put a lot of stress on your CNS, not to mention your joints, so it's impossible to constantly handle heavy weights all year around. That little time 'off' allows the body to recover and I find that I put on additional strength quicker if I do it this way.