There are points in the body where two or more threads of energy tie together. These points need a presence of mind to keep the threads connected otherwise they tend to separate and then we leak energy and weaken.

Crown
Third Eye
Tongue / Palate
Throat
Thymus
Lower heart
Solar plexus
Dantian
Perineum
Heels / Ground
Big toes / Ground
Touching thumb tips when meditating