Here is another prefab home/office that you can put in your backyard for work, exercise, and play. The Yardadu Outdoor Backyard Home Office (Zen Office 01) has 104 sq ft of space (13’1″ x 7’8″). It has a sound proof, well insulated construction.
The Zen Office 01 comes fully assembled. It has a titanium magnesium aluminum alloy frame. You can find out more about it here.