How to loosen fretting hand?

monte_arhuaco

I have been playing the bass for a few years now but I have always been wary of my technique, especially on my fretting hand. Everyone tells me to relax my hand as much as possible but I always end up placing lots of pressure on my fingers which leads to some fatigue and prevents me from playing music at high speeds. What are some good stretches or exercises that could help me overcome this issue?

X-Ryder 05/26/2019

I have one of these. I've had one for years, of varying resistances but the 5 pounder is my fave. It's invaluable. I'll sit & squeeze while watching TV or other mundane activities. I spend most of my days swinging a hammer so I find it has really, seriously, tremendously, helped my dexterity & the eternal battle against carpal tunnel.