Can any biology-savvy people comment on the viability of implants which boost the nervous signals to muscles, effectively making someone superhuman in strength and endurance? I can see how someone with these implants may end up killing themselves from over-exertion, but would something like this work theoretically, at least on a temporary basis? How would this be implemented? Would it be through a spinal cord implant, a change in blood chemistry or many local implants at major muscle groups? Would whether the person ends up killing themselves with these implants depends on how far he or she pushes it? Presumably, if the muscles know they are being overworked by amplified nerve impulses, they will adapt and grow stronger. But if the person overdoes it, they won't adapt fast enough.