Hey Dev. Nice detail given… First, overall context. You’re cutting hard from a higher body fat, using retatrutide, and stacking multiple compounds that all tax recovery in different ways. In my opinion, the fatigue you’re feeling is not unusual at all. It’s almost always the calorie deficit plus the GLP drug plus high training stress. No stack fully cancels that out. On YK-11. Honestly, if I’m being blunt, YK-11 looks better on paper than it feels in real use at least for me and others I have engaged with. Even injected, I’ve seen it cause joint and tendon discomfort, flat energy, and a that heavy systemic fatigue. The myostatin angle sounds great, but in practice I don’t see a huge muscle-saving payoff, especially on a cut. Your dosing isn’t crazy, but if this were me, YK-11 would be the first thing I’d question or remove rather than push harder. On fatigue support. I wouldn’t spend money on SS-31 or MOTS-c expecting a big turnaround. In my experience, they’re expensive and subtle at best.. If fatigue is bad, I’d first look at carbs around training, sleep quality, and stimulant use. DMAA can help you perform for an hour, but it often worsens next-day fatigue. MK-677 helps sleep for some, but for others it adds grogginess. For me personally I take mk677 in the morning on an empty stomach and let the nighttime normal natural GH pulses happen during the night. But understandably that wont help with hunger and possible day time fatigue(although i still think thats more from the YK) Enclomiphene can also contribute to lowgrade tiredness. I’d simplify before adding more. On training intensity, this is the key part. I agree that you need a strong keep this muscle signal, but I don’t think living at RPE 9–9.5 on a cut is smart. What I’d do is keep one heavy top set on big lifts around RPE 8, occasionally touching 9, then slash back off volume hard. That’s where most fatigue really comes from. in the 7–8 range makes sense. The compounds don’t protect your nervous system or joints, so pushing near-max effort every session usually backfires after a few weeks.