When long-lining on a circle, take care not to “longe” off the inside rein, drive around your circles. Do not underestimate transitions and when there is a connection, better strength and confidence, incorporate low, wide oxers. Hill work can be good, too, ‘specially when asked to back up a hill : )
Walking. Walking is good. Under saddle or from the ground a good WORKING walk can do wonders without impact or stress.
All of this can be achieved from long lines or a longe tape.
Sure there's right and wrong but mostly there's just a whole lotta different.