Puma is ready to tone things up for spring with BodyTrain, the women’s toning collection that had its public debut this past weekend in New York after a soft launch pre-holiday. According to the Herzogenaurach, Germany-based company, the shoes were tested at the Chemnitz University of Technology’s Human Locomotion Department and offer 11 percent more muscle activation than traditional walking styles. The shoes use the company’s BioRide rocker outsole, which features flex grooves to allow a natural stride. Two styles from the collection — the $90 BodyTrain Mesh, an athletic sneaker style; and the $90 BodyTrain LS Nbk, a lifestyle-oriented version in nubuck — are available at Lady Foot Locker and Puma retail locations. In February, the collection will expand to include an $80 Mary Jane-style shoe and a shimmery leather sneaker, also $90, that will be available at athletic and family shoe stores.