It’s called the One Arm Lift Challenge, and it encourages couples to try picking one another up with (you guessed it) only one arm. To do this, you have to insert your arm between your partner’s legs, balance their pelvis just behind your wrist, lift, and walk a few steps.

To complete the One Arm Lift Challenge, one person has to put their arm between the other person's thighs and lift them up. While the person doing the lifting has to be physically able to carry their partner's weight, the individual being lifted up off of the ground has to make sure that they maintain a tight core and don't lean forward.