Tim Cook has said that Apple's greatest contributions will be through its developments in health -- and nowhere is this more true than through the Apple Watch. Throughout its 10-year run, the tech giant has churned out lifesaving features around a user's wrist.

Apple doesn’t need a new health sensor to make Apple Watch exciting again. It needs to take some risks. The shape of the Apple Watch hasn’t changed in a decade. There have been slight variations in thickness, size, or curvature, but you’d be hard pressed to tell the difference without holding one next to another.

Here's a look back at the turning point that made the Apple Watch into a powerful health tool and what's kept it relevant in the face of competitors for a decade.