He bought a cheap tape measure for tailoring or whatever from bodybuilding.com. Just a few dollars. I broke it though haha. You can just use the spreadsheet starting today, or on whatever day you want to "start" so to speak, even if you are already in the midst of a routine.
C has a very, very fast metabolism. It is fucking insane. He actually tracks everything he eats, all his measurements, all his exercise, etc. He is trying to gain mass. He was doing strong lifts but switched to 5/3/1 and is seeing AMAZING results. He is very slowly putting on mass (1-2lb a month) but his body composition has improved significantly.