Both SwiftPaws home and commercial grade units are continuous loop equipment.
Continuous loop is where the ends of the line are tied together in a continuous loop.
Straight line is where the lure is pulled only in one direction, for example in FAST CAT® events (which stands for Coursing Ability Test) – which is a timed 100-yard dash where dogs run one at a time, chasing a lure.
You can set SwiftPaws home up to practice for straight line chasing. See how here.