Repeated exercise, or wasting, can change the way key genes work.
Not taking enough rest days can mess with results, FYI.
In other words, relax—a week or two off when you’re sick or traveling isn’t a dealbreaker.
In a bid to build muscle as I try to conceive, I compared an AI chatbot's suggestions with a human expert's advice. Amanda Smith is a freelance journalist and writer. She reports on culture, society, ...