Just a couple of random observations. The classic calf stretch (Leaning up against a wall or using an inclined plane) can be dangerous. It places an enormous amount of stress on a delicate and complex muscle attachment;1e. the Achilles tendon. The gastrocnemius et al does require attention. I feel rolling with a device like The Stik is safer and more effective.
Side planks may be too dangerous. They place a lot of stress on the wrist, elbow and shoulder. There are alternate exercises that are safer.
Just my worthless opinions.