I was going to say the same thing. A poorly maintained chain wears and “stretches,” and in turn wears gears faster. There’s no need to intentionally wear out co

I was going to say the same thing. A poorly maintained chain wears and “stretches,” and in turn wears gears faster. There’s no need to intentionally wear out components for better exercise - just ride a longer route faster, throw rocks in a backpack, etc. A poorly lubed chain only adds maybe 5-10 Watts, which is not much in terms of fitness improvements. And a worn chain and drivetrain is more prone to slipping or breaking, which is a good way to get injured. Edit: I just realized nsteel said pretty much the same thing below.