FINIS Foil Monofin Free Shipping Does Not Apply Learn to dolphin kick with the Foil Body Motion developed and made popular by Coach Bob Gillett. Using the Foil Body Motion a swimmer can use his or her entire body to create a powerful and undulating dolphin kick through the water. The Foil Monofin promotes an equal use of 'down' and 'up' kicks for propulsion throughout the entire dolphin kick movement by teaching the Foil technique and increasing the swimmer's core and leg strength.