I love 1/2 kneeling exercises becuase it builds strength while forcing the core to stabilize in a split stance position similar to what we do when standing on the pedals of out bike. When standing in a split stance position you can get away with some twisting of the hips; getting in the 1/2 kneeling position makes it easier to stay lined up right.

Here is how to do a row from this valuable base position. Try substituting one of your normal  rowing exercises for one of the variations to give your core a different training effect.