A weighted vest can help too. Even an 8-10lb one as seen on Amazon.
Or get out your kitty carrier backpack, and take your cat with you! 😺
I have a vest that I wear while fishing. When I start out, it’s weighted down with a six-pack.
I carry about 10-12 pounds of water, camera gear, food, pocket knife, whistle, Garmin, blister aid, and hiking poles. I usually get 400-600 feet of hill work in, but go to 1,200 feet now and then.
But I’m not consistent enough.