This workout: StrEndurance 1.0 - Workout C: Weeks 5-6, is the third progression in the 12 - week StrEndurance 1.0 program. Serious endurance athletes know that in order to get better in their chosen sport, whether it be cycling, swimming, running or triathlon, they need to do large volumes of sport specific training. This high intensity highly effective workout includes cardio intervals and exercises like push ups, crunches and lunges.