When you manage hard, faster than 10k race pace, hydrogen ions accumulate in your muscle mobile material. This causes an increase in intracellular acid solution. Since muscles don't function well in an acid state, muscle contraction becomes impaired and fatigue quickly ensues.

First, a word of warning: These stretches are suggestions only. Anyone have have any physical issues, whether acute or chronic, always along with your doctor, physical therapist, or trainer before you add…