Why Trust Us? When I heard the record for a woman holding an abdominal plank was measured in hours and not minutes (a whopping 4 hours 19 minutes and 55 seconds), I honestly couldn't believe it.

YOU KNOW THE SAYING: Work smarter, not harder. You may have already incorporated that mentality into your training routine, subbing unfocused, 60-minute workouts for strategic 30-minute sessions ...