Plantar Fasciitis is one the most common cause of heel pain. There are a variety of reasons why you might get Plantar Fasciitis but tight hamstrings, calves or Achilles tendon are major contributors. Rolling a tennis ball under the foot can certainly help relieve the pain, as can a number of Pilates exercises that help stretch and strengthen the hamstrings and calves.
Around 19 mins of video instruction.
This is a short 1 min excerpt of the video series