Back to the original question - it depends what type of exercise you are doing.
If you are training for an endurance event, like running a marathon, or triathlon, then the bias will be towards cardiovascular workouts and aerobic activities. There is a racing weight to be targeted - the leaner you are, the less the muscles have to work to carry that load at speed, over a specified distance. Think of Eliuid Kipchoge, or the build of any other elite marathoner.
On the other extreme, we have bodybuilders who are focused on sculpting that perfect body shape. This involves alot more gym work, weights, machines, HIIT, and static exercises. Much less cardio (which can reduce muscle mass).
