We lace the fingers to feel how they tighten together when pulled apart and to learn to work through this level when it appears in life. You can also use this natural lock for your benefit if you are giving someone a boost up a rooftop or onto a better firing position. The more your body is aligned and together, the better you will perform.
Lace the fingers together at the back of the neck or the back and have a friend grab you at the arms, neck or anywhere else and you need to walk your way out of the hold. Remember to keep thinking and avoid getting out of a hold and into a strike to the groin. Take note where all of your body is and feel through the contact and movement where your partners attention is and work with this understanding. You can have them hold with one hand and strike with the other or grab with a hand and use the legs to strike or anything that makes sense. Work honestly and for enough time so you learn to survive it and keep breathing.