thats nonsense... the true measure of strength is how much heavy stuff you can lift and move around, and for how long.. There are still people out there who have to move/lift really heavy shit as part of their physically demanding jobs, some of the strongest guys I have come across are dockyard workers and some furniture movers. This twink would die after 2 hours doing what some of these guys do for 8 - 10 hours a day 6-7 days a week.... I know you are having a go at bodybuilders but whatever 
Im affraid im gonna have to agree. He s not strong, he s ripped and muscular, has nothing to do with being strong. He might have stamina to lift small stuff or run) for a long period of time but strenght? How is he going to move heavy objects any better than someone who is heavier? Simple, he wont. It's like that basketball player i know who spend a lot of time shooting alone on the local playground, incredibly streaky...as long as he doesnt play against oposition; then he gets blocked, cant attack the rim, isnt physical enough...he just look good in a drill like shooting contest. Yes he can shoot, alone. But playing basketball with all of what it implies, being part of team? nope. He disappears. He 's one dimensional but he only has fun showing off that part of him.
You guys are confusing a lot of things. Now im not going to call him a twink or call him names either tho, as long as he doesnt pretend to be "strong". Moving your own bodyweight has nothing to do with being strong. Strong people with heavy muscular physiques (or not muscular i know fat people who are strong) are strong. I dont know any skinny people who s "strong". They re simply better at doing other kind of tasks, very repetitive, obsessive, fast moving of smaller items for example. He might be a good soldier or cross training runner too. He has the body / mind for that kind of stuff.
He s just showing off in this video, just like the shooter i talked about earlier, in a perfectly mastered environment. But get him out of this environment , and he wouldnt be able to adapt. We re all designed by our genes to do some tasks better than others.
As a ripped small ecto myself i perfectly know what I'm talking about. I m as muscular and ripped and know he probably doesnt eat much daily, except i dont do the gymnast stuff he does. My body (and somehow, mind) tho is perfectly suited for the tasks at my job. It's long gone the time i thought my little muscles could challenge the muscularity/frame of someone genetically bigger. There s nothing sadder than someone who spends his life thinking he is something(someone) he isnt. Most ecto teens who discover weight lifting often think they ve become like the big muscular endos and mesos, but after a while we all grow out of it. Well except for the steroid users who want to go beyond their genetical predispositions and want to become endos/mesos, rejecting their natural somatotype.