xkcd

Also have one end of the cable loose, and push the tension towards that loose end as you coil, unwinding that excess tangle as you go. Coil the cable in the direction in naturally wants to go after this tension has left and it's no longer fighting you.

I used to shoot live TV in random beaches around the world and this method worked great every time we packed down. We had coil sizes roughly the length of our forearm for super long cables.