Kayla's target heart rate zone is 142bpm—179bpm. tia's target heart rate zone is 150bpm—183bpm. they stop cycling and take their pulse, and both count the heart rate at 175bpm. if they decrease their heart rates by 20bpm, who will be in her thr zone?
kayla only
tia only
both kayla and tia
neither kayla nor tia

Given that 175bpm will be decreased by 20bpm, this will make both heart rate count of Kayla and Tia to 155bpm. Since Kayla's target heart rate was 142bpm-179bpm and Tia's target heart rate was 150bpm-183bpm, this makes 155bpm within their THR zone. Therefore, Both Kayla and Tia are in their target heart rate zone.

Muscles in the body us with a lot of things for example, if i wanted to lift a heavy box and had no muscle i would just collapse where i was because of the fact muscles hold us together. overall they are 650 muscle in the human body, all of them have different purposes and ways to keep us together. there are three types of muscle in the body skeletal, smooth, and cardiac muscle. skeletal muscle are attached to the bone and with movement. smooth muscle, this is found in the wall of our organs, such as our stomach, this muscle with movement   as well, without this muscle, we would only be allowed to eat small amounts. the cardiac muscle is the heart muscle and probably the most important one. these are only found in the walls of the heart and the heart pump blood to the other parts of your body. we have two different types of muscle fibers, slow twitch and fast twitch. slow twitch muscles enable long-endurance feats such as distance running. fast twitch fatigue faster but are used in powerful bursts of movements like sprinting. there are three different types of muscle contractions concentric, eccentric, isometric. concentric contraction causes muscles to shorten, thereby generating force.   eccentric contractions cause muscles to elongate in response to a greater opposing force. isometric contractions generate force without changing the length of the muscle.: //athleticquickness.com/muscle-contraction-types-part-1/

Eating right and exercising daily