How does the heart become more efficient over time with cardio?

According to the article, when our sleep/wake cycle breaks down, we are at an increased risk for all but which select one: a. respiratory illnesses b. dementia c. diabetes d. heart disease

During weight training, when should you exhale? (hope) a. on the lift b. on the recovery c. before the set d. after the set

You should expect adults to respect you in return. true false