60+ minutes of exercise per day to maintain weight after age 50

[jobob]

I think the biking 10mph is misleading to us. That would be pretty speedy for my spouse and for my sister and would get their heart rates up about equivalent to a brisk walk. It also probably does not assume a lightweight road bike either.

Of course. Common sense has to come into play here, most of us here probably know what constitutes moderate activity for us as individuals, and what kind of activity is necessary to elevate our heart rates enough to be worthwhile. These guidelines are likely meant for sedentary people to give them some ideas.