So you want to know how to climb mountains?
First you need to forge an iron core!
Give your abs altitude with three exercises
Start to get into a push-up position, but bend your elbows and rest your weight on your forearms instead of your hands. Your body should form a straight line from your shoulders to your ankles. Brace your core by contracting your abs as of you were about to be punched in the gut. Hold this position for 30 seconds while breathing deeply.
Lie face-up on the floor with your knees bent and you feet flat. Raise your torso to a sitting position. The movement should be fluid, not jerky. Slowly lower your torso back to the starting position.
Grab a chin-up bar with an overhand, shoulder-width grip, and hang from the bar with your knees bent and feet together. Simultaneously bend your knees, raise your hips and curl your lower back underneath you as you lift your thighs toward your chest. Pause when the fronts of your thighs reach your chest, then slowly lower your legs back to the starting position.