GoFit Kettlebells, the hot new dynamic training tool that deliver an intense workout that can be done in half the time of a traditional workout, while producing twice the results. Introductory Kettlebell DVD by Sarah Lurie included.GOFGFKBELL15. GFKBELL15. Gofit GOFIT GF-KBELL15 KETTELBELL & IRON CORE TRAINING DVD (15 LBS, RED).