I have a 5 mile circuit in the foothills where I live that I walk 6 days a week carrying a ~10lb rifle, no sling. Out the door at 6am, back to the shack by 8am. One day off for good behavior...

Alternate days I'm also wearing a back pack with either 20, 30, or 50lbs of iron slab.

These days I'm getting the miles in on snowshoes.

It's you and the bullet, and all the rest is secondary.