80/20 Endurance 80/20 Endurance Strength and Mobility Plans plug right into and supplement your 80/20 Endurance plan, or any endurance plan of similar duration. Just load the Strength or Mobility plan onto your calendar using the same start date as your primary plan. Strength plans come in two types: Free (requires coupon code 8020Strength at checkout) and Premium. See Strength Training Plan Options for more information.