Unlock Cristiano Ronaldo’s secret abs routine with this high-intensity, no-equipment workout inspired by the football ...

Core training has always been part of military PT and fitness testing. From crunches to sit-ups, flutter kicks, leg tucks and plank poses, the U.S. military uses many exercises to test core strength.

Don’t wait for the gym! Get explosive abs at home in only 7 minutes with this intensive, no-equipment core workout. Perfect for all fitness levels. #HomeWorkout #AbsChallenge #CoreWorkout #NoEquipment ...

Nick Blackmer is a librarian, fact-checker, and researcher with more than 20 years of experience in consumer-facing health and wellness content. Lie on the mat with your arms extended straight up.