Shane's target heart rate zone is 130 - 168. during a race, he checks his wrist monitor, which indicates that his heart rate is currently 142. which of the following will him get the most productive work out, based on the information he has gathered? a) take a water break and reduce his heart rate. b) decrease to a job then run again. c) keep running at the same speed and intensity d) walk one minute, then begin running at the current pace