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T-bar rows -- and almost all row variations, in fact -- work all the major muscles in your back. This includes your lats, teres major or "little lat," trapezius and erector spinae. T-bar rows also work your shoulders and the pulling muscles in your arms -- biceps, brachialis and brachioradialis.To be honest, T-bar rows are imperative for back development and if you’re not doing them (with proper form) - or at least some version of a heavy row - you’re doing your back a disservice and it will be noticeable.It’s definitely one of the basic exercises but it’s also definitely becoming extinct in commercial gyms.