Although this is an interesting result, beware, n=25 for the whole study, which means there were only eight people per group.<p>We did a data analysis on several thousand Apple Watch users, looking at whether step count or exercise intensity really drives one key outcome (a lower resting heart rate):<p><a href="http:&#x2F;&#x2F;blog.cardiogr.am&#x2F;2016&#x2F;02&#x2F;12&#x2F;do-you-really-need-10000-steps-a-day-2&#x2F;" rel="nofollow">http:&#x2F;&#x2F;blog.cardiogr.am&#x2F;2016&#x2F;02&#x2F;12&#x2F;do-you-really-need-10000-...</a><p>Like this study, our conclusion was that intensity matters most: you need to get your heart rate above 150 to get the best benefit. In our data set, 45 minutes of exercise per week was the &quot;knee&quot; of the curve.<p>I&#x27;d actually love to run a scaled-up version of the NYT study. I think with wearables generating so much data, we really can start to answer questions like: &quot;What is the best workout?&quot; Or perhaps more importantly, &quot;What is the best workout for you?&quot;