Is “No pain, no gain” good advice?

Sean Kuechenmeister, Certified Athletic Trainer at the New York Sports Science Lab brands this “a myth for sure.” Soreness, he says, is the breakdown of muscle tissues followed by the release of toxins. And pain lasting over 72 hours suggests you're under-recovering and overtraining. Andy Stern, Founding Trainer and Director of Talent Rumble Boxing adds refusing to take a break yields constant wear that the body can’t handle. “If I'm doing a bicep curl, a small tear is going to happen so the body is going to repair itself because the machine knows how to survive.” But it needs downtime to heal itself.”