Table 2.

Adapted format for Gentile’s taxonomy of motor skills [17]

	Action Function
	Body Stability		Body Movement
Environmental Context ↓	No object manipulation	Object manipulation	No object manipulation	Object manipulation
Stationary regulatory condition and no-intertrial variability	1a	1b	1c	1d
	Practicing a golf swing without a club	Hitting balls at a driving range, from the same spot	Practicing the same dance steps	Practicing the same dance steps with a partner
Stationary regulatory condition and intertrial variability	2a	2b	2c	2d
	Practicing separate tai chi moves standing on the same spot	Hitting ball with cue from different locations on a billiards table	Practicing different dance steps on own	Practicing different dance steps with a partner
In-motion regulatory condition and no-intertrial variability	3a	3b	3c	3d
	Riding on a stationary exercise bike at a constant speed	Fishing while sitting on a boat and only casting once	Practicing lawn bowls delivery with a walking step without a ball	Returning a tennis serve from a tennis ball pitching machine
In-motion regulatory condition and intertrial variability	4a	4b	4c	4d
	Riding on a stationary exercise bike at different speeds	Fishing while standing on a boat; throwing cast out in a new spot each attempt	Walking in a busy shopping centre	Riding a bike on a bike path