Minecraft Steve is an absolute fucking beast

To begin, Steve can wear a helmet, chest plate, leggings and boots. The heaviest armour in the game is gold armour, which is crafted using gold ingots. One gold ingot weighs 12.4kg, and it takes 24 to craft a full set.
24 x 12.4 = 297.6kg. The average man in the US weighs about 89kg. This means Steve can carry the weight of over three grown men in armour alone.

We’re only getting started.

The heaviest item in Minecraft is the Enchanted Golden Apple, crafted with 8 gold blocks and one apple. One (1m^3) block of gold weighs 19300 kg, so 19300 x 8 = 154400kg. With the apple included, 154400.8kg. Golden apples stack to 64, so 64 x 15400.8kg = 9881651.2kg.

Shulker boxes can hold 27 items. 27 x 9881651.2 = 266804582.4kg. Shulker boxes are crafted with one chest and two Shulker shells. Chests are crafted with 8 wooden planks, weighing roughly 1100kg each (per cubic metre). Ignoring the minimal weight of the shells, one Shulker box weighs 1100 x 8 = 8800kg. 8800x27x64x37 = 562636800kg.

Ender chests make things interesting.

Ignoring the weight of the eye of ender, the 8 obsidian blocks needed to craft the Ender chest weigh 2322.68kg per cubic metre each. 2322.68 x 8 x 64 x 37 = 44000849.92kg.

Ender chests have 27 slots, each holding a Shulker box full of stacks of Golden apples. 27 x 266804582.4 = 7203723724.8kg. Ender chests can stack up to 64. So
64 x 7203723724.8 = 461038318387kg. Steve has an inventory of 27, a hotbar of 9 as well as an off hand.
37 x 461038318387 = 17058417780319kg. With the weight of Steve’s armour, we get 17058417780616.6kg. If we add this to the total weight of the Shulker boxes and ender chests, we end up with 17,058,980,417,416.6kg. That’s fucking seventeen TRILLION kilograms.

The largest mountains in the world weigh roughly a trillion killgrams. That means Steve can carry the weight of roughly SEVENTEEN fucking MOUNTAINS stacked on top of each other, while running, jumping and climbing with no effect to his speed or movement.

I rest my case.