The Nike Free TR for women is a sneaker built for a multitude of training activities from cardio to weight lifting, and when it was time to upgrade it to the new Nike Free TR Flyknit 3 designers focused on two main aspects:
1) The way the foot hits the ground during standard training routines. Training in 2018 is more versatile than ever, and any chosen workout can involve practices like jumping, running and lateral bounds as well as exercises that involve weights and HIIT. Research and testing focused on the biomechanics of the foot during these movements, which developed insight into how the foot changes shape on impact and when loading.
2) The location of where the foot sits in the trainer. During training routines, athletes generally move on their forefoot and thus their foot often slips away from the heel counter when in motion.
Nike designers discovered that when arches collapse and toes get splayed, the contact area to the ground increases, which could lead to better stability. With the goal to increase stability in the heel and maximize flex and movement in the forefoot, the designers evolved the shoe from the ground up, landing on seven key updates for the new Nike Free TR Flyknit 3.