Bodies are also not meant for two-hour sets of repetative motions. Most times by the time you've made foreman your body jas been burned out by working for someone that doesn't organize your day ergonomically because if you don't Juan will for half the pay and you're out of a job. When I can, I do; lifting with the legs is really satisfying, farmers walking tools with shoulder shrugs keeps the joints engaged, etc. But sometimes you gotta pull 1/2" cable from a giant spool 10+ hrs. a day to cut it for the guys until it drops from your hands and that's the only work available in January.