The ground heels for the runner heels we tongklom because of the circle. If it does not fit in the gym with the stability of an injured heel and back heel pain. Insole should be solid and tight to the stability of the heels as well.
For runners to round the heel. Because we rounded heel If it does not fit, no stability of the heel. Subsequent to injury and pain behind the heel. The soles should be hard and tight to the stability of the heel as well.
The heel for runners must be round, because our heels round. If it doesn't fit that no security of the heel. Will the injury was back pain and heel. Stiff and tight shoes should be for the stability of the heel as well .