Should Ectomorphs workout?
Ectomorphs tend to excel in endurance-type activities, and many of them prefer cardio training to weightlifting. The key to stimulate muscle growth is to do a minimal amount of cardio required for general health. Three times a week for 30 minutes is recommended.
Are HIIT workouts good for Ectomorphs?
But ideally it's not the only exercise you should be doing (nor is any other steady-state aerobic activity, like walking or cycling) — especially if you're an ectomorph. For a more balanced routine, consider adding HIIT (high-intensity interval training) or strength training, says Feit.