[cykolulu]

how good are they at conditioning i.e building muscle,losing fat

 

[junkyard]

if you want to lose fat just walk your dog its the best way.

As i said, mills are a great tool but they are part of a toolbox and should be used in conjunction with a few other tools that with overall benifit the dog the right way, diet being number one.

If i was you i would try to find some keeps and read them to help you understand the roles and tools better before jumping into anything.