Stimulants Crystal: why am i not sore?

Hey everyone! First post here, let me know if I mess something up.

I have been using regularly for nearly a year now(crystal). Since the first time I tried it, along with every comedown came aching muscles, regardless of how much or little I smoked. But, this time it was different. The product looked, smoked, and tasted like it was pretty decent quality, and it got me pretty high. Anyways, the weird part, we smoked a g between two people, and (tadaaaa) absolutely NO soreness or aching, at all. Dont get me wrong, that made my day, but why would that happen?? Possibly more pure? Or a different type of cut than I'm used to? Any ideas are greatly appreciated.

Isomers and the lack thereof.

Probably a cleaner product you have there. All methamphetamine contains impurities but you may have gotten a really clean batch. I also tended to have a lot of muscle soreness after using meth which could be from the impurities, muscle tension or movement during the high, or some other odd reason. I do know the tweakier and twitchier the high, the more sore the comedown is though. I mainly got that feeling from smoking half a gram- a gram. Hope this helps you out.