It’s long been conventional wisdom in the world of fitness that you can’t get into good physical shape without some suffering. 

Thus, the well-worn expression: “No pain, no gain.” 

This phrase became popular in the early 1980s when Jane Fonda started using it in her big-selling aerobic workout videos. She would also urge viewers to “feel the burn.”i   

But should we judge the effectiveness of our workouts by how much pain and soreness we feel?… Read More