Running is a good calorie burner, but the repetitive motion doesn’t always do a body good — the constant forward motion, with little to no variation increases likely hood of developing tight hips, overuse injuries, and other conditions.

This is one reason why in class we mix it up with the side shuffles, cross overs, running backwards, to name some of the main variations.  

Personally, to make my running more natural with variation, i go trail running.  Trails by their nature make us move swiftly and changing direction, continually adjusting.  Then there are hills which are a great way to burn calories and get super fit.