Where the legs intersect the horizontal boards (I call them "stretchers") I always overlap the boards and fasten them securely with four or five 3-inch deck screws or 3-inch nails. When two boards of decent width are overlapped and joined securely, they form a good tight connection that resists movement (sometimes called "racking") when the workbench is bumped or moved.
I say "decent width" because width of these structural members is important. I have built workbenches and shelf units using 2x4's or 4x4's for the legs, and using 2x4's, 2x6's or 5/4x6 deck boards ripped in half (cut lengthwise) on a table saw for the "stretchers". I would never use 2x2's for legs or horizontal supports... they aren't very strong and they aren't wide enough to form a solid connection.
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