Striking and Posture.

Heel strikers tend to have padded shoes with a large heel-toe ratio, meaning there is a block of foam on the heel slightly thicker than the padding under the fore-foot. This allows them to strike heel-first without feeling the impact until they develop Plantar Fascia or other pains. 

However, this also means you are not landing close to the body, causing unnecessary stress on the body.

• Landing far from the proximal body is OVERSTRIKING. Aim to shorten strides but increase cadence (more small, frequent steps)
• Try to channel the motion of marching whereby the knees and ankles are close to the line of the body.
• Forward leaning running is better. Running with an arched lower back causes pain and is common with heel strikers who lean back with impact. 
• Soft and smooth running is key.

Dear Heel Strikers,

You  do not have to change everything. It is okay to heel strike so long as it is not pounding impact, putting too much pressure on the body. Try to be smooth and soft when landing/propelling. My suggestions above are just tips on how to be smoother/softer.