I took an old piece of 2x6 lumber, cut it into four pieces about 15
inches long, and nailed them together to form a rectangle.

I sit on it, to weed, plant, etc. Because the base is about 6x15
inches, it doesn't dig into soft soil. And it was cheap!

You can make the "risers" longer or shorter, to suit you own physique.

vince norris