It’s pretty easy with a little baby LOL they don’t need much. You actually don’t really want to walk them when they’re real little anyway even if they theoretically had their shots as tiny babies LOL cause it can be bad on their joints to do like structured walks on pavement too much. Better to play with them on the grass or something and let them pick their own pace, etc. and it’s soft. And also you can train them and that’s exhausting to a baby LOL basic obedience/manners/life skills or even tricks and train for meals, etc. as well as slow feeders, puzzle bowls, snuffle mats, other mental stimulation. Exhausting for a baby haha maybe more so than physical exercise.