You could get pregnant, even if you pulled out.
Fitbits, smart watches and pe'dometers can monitor heart-rate.
Different types of food groups have different types of micro nutrients, it is important to eat a balanced diet because it may prevent a vitamin or mineral deficiency. If a person excludes a group of food it can also lead to an unhealthy relationship with food.
Experienced athletes work out so much they are in a plateau phase, it is harder for them to increase fitness
Contraception has many methods but each artificial method may not protect all kinds of STD's. Other methods may only protect the bacterial type but not those that viral type or vice versa. The best way to protect oneself from STD is to have a monogamous relationship with an infected partner with full awareness of the fertility cycle.
