Hang from a bar or rings and lift your legs straight out in front of you.
While standing, put your hands on a pair of rings at knee height, or a wheel with handles, then keep your feet in place and slide your hands forward until you're in a plank position. Then slide your hands backwards until your upright again.
Put a third of your weight in a camping backpack. Go for a long walk with lots of hills.
While wearing said bag, get into a plank. Lift up one hand and touch the opposite shoulder. Then switch hands and do the opposite shoulder. Do these for time, add time or weight each time you do them.
Hang from a bar or rings and lift your legs straight out in front of you.
While standing, put your hands on a pair of rings at knee height, or a wheel with handles, then keep your feet in place and slide your hands forward until you're in a plank position. Then slide your hands backwards until your upright again.
Put a third of your weight in a camping backpack. Go for a long walk with lots of hills.
While wearing said bag, get into a plank. Lift up one hand and touch the opposite shoulder. Then switch hands and do the opposite shoulder. Do these for time, add time or weight each time you do them.