So something I read recently got me thinking about the burning sensation/tightness from lactic acid buildup. And I realized that I really only get that sensation in certain smaller muscle groups (mainly forearms).
I never really get any feedback that says I've hit my pecs or back or glutes particularly hard. I work them hard, but there's no burning, no tightness, no soreness.
Why is that? I mean, strength and size gains are ultimately the goal, so that should be the measure of progress, but I was curious.