1. during really easy workouts, you work out at the lowest end of your target heart rate zone. what should the words in italics be replaced with to make this sentence more precise?

high frequency
low intensity
high intensity
low frequency

2. daisy has added 30 minutes of rowing and 20 minutes of running to her fitness routine. these activities are most likely going to improve her

physical composition
muscle fitness
cardiorespiratory fitness
flexibility

3. to target different goals and muscle groups, what should you do?

alternate workouts
run quickly each morning
do yoga in the evenings
drink water and sports drinks

exposure to hazardous carcinogens and toxic substances can cause breathing problems, such as copd and various types of cancer. it also increases the risk of heart attacks and strokes and has serious (but no less unattractive) side effects, such as aging, yellow teeth, a terrible smell and damage to the vocal cords.

starvation is bad because your body needs nutrition and to deprive it of nutrition can cause problems with both health and fitness.

explanation:

it can make weight loss slow down over time, but it won't cause someone to gain weight depsite restricting calories. starvation causes weakness in the senses like thirst.