Each bean contains 0.8 - 2.5 % caffeine. For your information in an average cup of coffee you have 75mg caffeine. One cup of coffee contains around 25 coffee beans, and you are not getting the full coffee bean in coffee, so the caffeine can add up if you eat a lot.
The reason why temperature effects muscles is because of the numerous atoms in the body that react to temperature. When the air, or body temperature is colder the atoms tend to stay closer together, causing less movement...when it is hot, the atoms (molecules) move around more, causing more range of motion. It also allows blood to flow more easily when it is warm than cold.
A normal core body temperature ranges from 97.7 degrees to 99.5 degrees Fahrenheit. During exercise, your temperature can easily reach above 104 degrees, according to professor Len Kravitz, Ph.D., at the University of New Mexico.o matter what the temperature is outside, your core body temperature will increase over time with exercise. How high your body temperature rises depends on environmental factors and the pace you keep up during your workout.