It means someone is working as hard as they possibly can.

Maximum Effort

The phrase doesn't always mean physical stretching; it can refer to effort or capacity.

Not Literal

Often used to describe a situation with high pressure or intensity.

Indicates that something is operating at its highest capacity or limit.

Not just for physical space, but for resources like time, money, or equipment.

Hints that the situation is demanding or a person is under a lot of stress.