A world class weight lifter would struggle even with a 10 pound dumbbell if he's doing it for the 10000th time straight. Don't take the number literally like a kid but you can clearly see that he's been doing it for quite some time by that heavy sweating. Gon was the one who was actually struggling while just
pushing the gate. Even a child knows the difference between pushing and lifting an object. And for your info Zoro isn't just lifting the weigh normally but by his legs and that too just on 2 thumbs. So, you should get the idea. God I didn't know one day I'll defend Zoro. Also don't use that Usopp emoji plz, it's really ugly.

