Soreness needs to be treated. The load in the plantar fascia needs to be reduced and healing needs to be promoted. An essential part of lessening the load is the flexibility exercises of the calf muscles. Many research studies have shown that it is very helpful, so it is an key part of the approach. https://www.blogarama.com/health-and-fitness-blogs/1354309-FootStoreau-Blog/68985433-should-you-use-night-splints-for-plantar-fasciitis