[SebKba]

You can build aerobic power (at least to some extent) using anaerobic exercise like sprints / intervals. I would assume a combination of aerobic & anaerobic exercise is probably the healthiest because that way all energy pathways and muscle fibres get activated.

I always think it's crazy to expect humans to function properly without exercise. We see the problems in all other animals when they become sedentary below the level that they would historically be expected to do. Yet somehow some people seem to think we are an exception to this rule.

[Chris2048]

"Healthiest" is pretty vague in this context, as we're tracking a particular result - mental ability, and possibly neurogenesis.