POWER SYSTEMS BRAND. A challenging alternative to traditional strength training. VersaFit¨ Logs have multiple handles and Velcro straps that allow you to vary exercise focus and function by gripping the bag in different ways. The durable, soft-sided VersaFit¨ Log allows you to train balance, plyometrics, rotational movements, Olympic lifts, and chops. Use indoors or outdoors. Shell only option allows weight customization to meet individual needs.