Isometrics for Speed by: Paul from Isometric Training.com
Hi Hishaam,
Thanks for the question. The answer is neither. You do not need weights, nor do you need elastic bands for Isometrics - just you. And that's all you need to increase speed.
I wrote an article on just this topic here - https://www.isometric-training.com/Isometric-Training-for-Martial-Arts-Speed.html