The only things that's been a big impact on progress is burnout, but I haven't had much choice to take a rest since I need to bring in finances for bills. Admittedly small naps have helped as well as mental breaks with gaming but as for physical strain all I can really do is stretch for a bit and quickly get back to it.
I could also take into consideration the fact that all I've been working on lately is finished/fully rendered stuff so I haven't had the freedom or chance to just do loose sketches like I would outside of crunch. It's probably the reason I'd like to sell those as a commission option for cheap but most folks seem to prefer fully rendered art so all I can do is try to deliver to the best of my ability