I thought you might find the information regarding plantar fascitis in the American Council on Exercise Personal Trainer Manual under “Common Musculoskeletal Injuries and Implications for Exercise” helpful. It states:
“Conservative management of this condition may include the following:
Modalities (i.e. ice)
Oral anti-inflammatory medication
Heel pad or plantar arch
A medical doctor may prescribe physical therapy, a night splint, or orthotics, or inject the area with cortisone. (Cole, Seto & Gazewood, 2005; Buchbinder, 2004).
A client with plantar fascitis may be clear to exercise immediately to tolerance but most often with restrictions from his or her medical professional. The goal is to design a program that challenges the client but does not excessively load the foot. Integrating specific foot exercises into the client’s general fitness program often provides the best results. This allows the client to work toward his or her fitness goals as well as address the foot problems.”
If you like to read more you can find this information on in chapter 15 of ACE Personal Trainer Resource Manual on page 553.
All the best to you.