If you can't take your heart rate, a good way to recognize that you're exercising efficiently is whether or not a. your muscles are burning. b. you're experiencing a little bit of huffing and puffing. c. it's difficult to have a conversation. d. you're gasping for breath.

If you can't take your heart rate, a good way to recognize that you're exercising efficiently is whether or not it's difficult to have a conversation. Correct C If you are able to chat while exercising you're probably exercising at too low of an intensity. If you can’t easily carry on a conversation without some breathlessness you’re working at least moderately hard.

answer; i believe that the correct answer is (a) restriction);