Greek philosopher Plato told Olympians to avoid sexual activity before races, a myth that hung around through "Rocky." In 2016, the University of Florence analyzed hundreds of studies on the topic and found no evidence that sex is detrimental to athletic performance. "We clearly show that this topic has not been well investigated;" says Laura Stefani, of the University of Florence, Italy. "Unless it takes place less than two hours before, the evidence actually suggests sexual activity may have a beneficial effect."
Nearly 80 percent of personal trainers schedule hourlong sessions, but around 40 percent will do a half-hour, and around 20 percent will do 45 minutes, squeezing in more clients at peak hours while saving them money. But Arizona State University researchers discovered that some people benefit more from three 10-minute sessions each day than from one 30-minute session. Few trainers will agree to that timetable — but you aren't locked into an hour, either.
Nope, you'll see results when you see them. But Matt Fitzgerald, an author, coach, and trainer, says it can be rapid, even though "I'm not telling you to lose weight quickly," he says. "I'm telling you to make big improvements in your diet and exercise habits instead of marginal improvements and to really commit yourself to them instead of going into the process halfheartedly."