I’m usually pretty good about doing things I don’t want to do. I’ve been alive long enough to know that getting starting is always the hardest part. But nothing is harder for me to start than doing weights.I say “doing” weights because I don’t actually lift anything other than myself. I started out with push-ups because a friend suggested a “100-push-up challenge.” I had never done any upper-body exercise of any kind. I couldn’t imagine I could do 100 push-ups—and it turns out I was right. I couldn’t for almost two years.But I did them almost every day, and I ...