ther are so many different factor that go into getting your desired look.
so with that in mind, your training should be up to your own individual goals.
for myself (as far as cardio), i want more mass therefore fast twitch muscles. so it is important for me to develop my strength and speed systems, ie sprints, stands, etc.
but if an individual wants to continue past about two minutes of high intensity workouts, they need to have their aerobic systems developed as well (slow twitch muscles). endurance. (from my experience you will get a leaner look with this approach to cardio)
so it just boils down to what you want and what your goals are.
so with that in mind, your training should be up to your own individual goals.
for myself (as far as cardio), i want more mass therefore fast twitch muscles. so it is important for me to develop my strength and speed systems, ie sprints, stands, etc.
but if an individual wants to continue past about two minutes of high intensity workouts, they need to have their aerobic systems developed as well (slow twitch muscles). endurance. (from my experience you will get a leaner look with this approach to cardio)
so it just boils down to what you want and what your goals are.