Who ever invented time-based wall plank challenges is an evil, arm and back hating monster.
Nearly made it to the minute mark twice before I ran out.
So close. Not giving up.
Medieval torture in the form of exercises.
Short version is you do a plank, but instead of having your feet on the floor they are over your head touch a wall.
It is as easy as it sounds.
@RussSharek wall plank? what's that??