Try this "thumb to thigh" swimming drill from USA Triathlon Coach Mari Fridenmaker.
Triathlon - Swimming Thumb to Thigh Drill
Latest from Mari Fridenmaker
Mari Fridenmaker is a USA Triathlon Level I Certified Coach in Atlanta, Georgia. She is the President and Head Coach of Blue Iron Coaching, LLC. She has been active in the sport of triathlon since 2003 and has been coaching athletes of all levels since 2007. Her services include Team Coaching, Personalized Coaching, Private Swim Lessons and Individual Consultation. For more information, please visit her website, www.blueironcoaching.com. She can be reached at firstname.lastname@example.org or 404.667.0817.