Much of the hype surrounding the recent barefoot running trend emanated from a study out of Harvard by Dan Lieberman and colleagues (2010). In that study, the authors investigated a group of barefoot runners, the Kalenjin of Kenya, and analyzed how their feet hit the ground when they ran. They found that barefoot runners were mainly forefoot strikers (they hit the ground near the ball of their foot), compared to those who have been running in shoes their entire lives, and were mostly rearfoot strikers (they hit the ground with their heels first). The authors also observed that heel striking resulted in a more rapid increase of reaction forces at the foot. From this, the researchers suggested that perhaps all humans ran with a forefoot style before shoes, and that this was a mechanism to possibly prevent injury. Many have taken the results of this study to suggest that everyone should be running barefoot, or at least, with a midfoot (striking the ground the instep or ‘middle’ of the foot) or forefoot strike pattern.