Trick # 3) To open the hand start by bending the wrist slightly 1st. Bending the wrist stretches tendons that cross over the wrist and go to the ends of your fingers. Caution: Aim for a few degrees of wrist motion (see angle in photo) to protect these finger tendons. As the tendons stretch, the fingers will open so you do not have to struggle to grab fingers that are in a tight fist.
Trick # 4) A fist will relax more if you straighten the thumb first. The thumb has half the muscles in the hand so it is a bully. The trick is to wrap several fingers around the base of the thumb rather than grab the thumb close to the fingernail with the bony ends of your fingers.
Always keep the fingers in a straight line with the palm. Clients should NOT passively straighten their fingers like in the photo on the left. Caution: Overstretching the fingers at the first joint (MPs) can damage muscles needed for active movement (lumbricals and interossei).