Comparison

Other Products	# of people required to use	Max. length to use	Use while doing sports or other activities?	% of effectiveness to your body	Negative side effects	Cost
Sprinter Sled	1	100 yds.	NO	30-70%	pull system poorly effects lower back	$199.95
Sonic Parachute	1	100 yds.	NO	0-60%	need to run full speed to operate	$64.95- $130.00
Speed Builder	2	100 yds.	NO	0-70%	requires partner to operate	$44.95
Rocket Rope	3	30 yds.	NO	0-70%	requires large area & faster runner must lead	$79.95
Sprint Resistor	2	100 yds.	NO	0-70%	requires partner to operate	$99.95
Sidewinder	1	100 yds.	NO	0-50%	strains on ACL, MCL & causes tripping action	(thin, med, thick) $120.00
	1	Unlimited	YES	100%	None	$49.95