According to Guinness World Records, the “longest time in an abdominal plank position” is eight hours, 15 minutes and 15 seconds and was completed by former Marine George Hood in Naperville, Illinois ...
WHEN IT COMES to training your core muscles, most guys tend to value lots of movement. They'll rip through reps of situps, leg lifts, and twists; they might even cycle their legs back and forth like ...
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