Varying exercise training approaches may be optimal for general fitness due to unpredictable individual responses.

“And so I think when it comes to exercise training, for many individuals, there's an analogy and that's it. Maybe do different types of training. And that's gonna... so whether you're someone who really responds to sprint training or really responds to moderate, we can't necessarily predict that. And so varying up your training, just like we spread out our risk when we invest, might be the best approach.”