one of the guys at the gym keeps asking to check my progress on the leg machine and today I was fed up

There's this guy at the gym, some kind of data obsessive named Walter. Not really the best social skills. I'll be on the leg press and he'll come up with a measuring tape and try to check the circumference of my calves. I didn't really mind at first because I was interested in my gains, but it has gotten to be too annoying. Today it was so hot and I didn't want anyone coming near me so I finally had to tell him "No more calf measures, Walter!"