Sam Davis on Instagram: "ISOs are for EVERYONE. Healthy? ISO. Injured? ISO. You practically can’t screw up with isometrics. You get a tremendous training stimulus with very low risk of injury. If you are holding a position, you will fail before something breaks. Your brain literally won’t let you create more damage. It will end the set. It will make you give up. Because of the minimal movement you don’t create tissue damage like traditional weight training does. You can certainly over do it with