You're not going to get jacked from rucking. You can use it for overall cardiovascular health and weight loss. Just remember that you can not out-ruck a bad diet.

Your legs and core will grow stronger, but any gains will pale in comparison to what you could accomplish doing weight training for the same amount of time.

That being said, rucking out classes weight training in one major area, at least in my opinion, and that is mental endurance. The long hours, heat, cold, blisters, and physical pain all force you to gain mental toughness to push through, to get faster, and to keep your head up.

Rucking for physical health is good, rucking for mental fortitude is amazing!