I'm around 6'1, 140 lbs which is way too low compared where I think I should be. This is partly due to me running competitively(have won a few league and county championships) and overall not really doing anything related to building muscle. For reference, I can do about 30 push-ups max and maybe a couple of pull-ups. I'm only a junior so I have plenty of time in regards to training, but any beginner advice/routines would be appreciated(no gym access though.) Thanks!