Merely walking is overrated, especially commute-style walking. It is much better than doing _nothing_ but as the main source of physical exercise it's not great

Merely walking is overrated, especially commute-style walking. It is much better than doing _nothing_ but as the main source of physical exercise it's not great. I used to walk 12000 steps every day, including on a treadmill at home. My leg muscles were awesome, and my cardio health was great. But my upper body was weak, and eventually I had to start physiotherapy to strengthen some muscle groups to correct for bad sitting posture that was causing pain. So I started doing weight and resistance training, my muscle mass went up, and I'm much healthier as a result. I'm also saving tons of time commuting by car instead of having to walk. And I still do weekend walks/jogs around the parks and my neighborhood for fun.