A spotter should be used for all of the following exercises except

Low cardiorespiratory fitness is responsible for more deaths than other risk factors such as obesity, smoking, and high cholesterol. 

A braking force that resists gravity or decelerates a rapidly moving body segment best describes what muscle action?

For moderate exercise intensities, heart rate is linearly related to VO2 max

For coronary heart disease (CHD) screening and classification purposes, what minimal intensity should be attained during a graded exercise test (GXT)? 

The improvements in cardiorespiratory fitness are substantially greater when aerobic exercise is performed in a continuous training bout (without rest intervals) compared to a discontinuous training bout (exercise interspersed with rest intervals) of equal intensity and total work output. 

Pedaling rate (rpm) does not have to remain constant on an electrically braked cycle ergometer in order to maintain a given power output.

An individual with excellent cardiorespiratory fitness should have a higher heart rate at a given submaximal workload compared to an individual with poor cardiorespiratory fitness.

Core stability training done on unstable surfaces places an emphasis on developing muscular endurance more than muscular strength or power.

Riding a bicycle at 18 mph (29 km/h) would be considered moderate-intensity exercise.