Here are the answers to the brain teaser questions:
1. The 6 types of training are: Interval, Continuous, Fartlek, Circuit, Weight, and Cross
2. Exercises for a circuit to improve muscular endurance could include: pushups, situps, squats
3. Continuous training improves cardiovascular fitness because it involves moderate exercise for at least 15-20 minutes with no rest in order to improve aerobic fitness.
4. Interval training involves periods of hard work followed by periods of rest in order to improve mainly speed but also cardiovascular fitness through high intensity intervals.
5. Fartlek training combines high and low intensity work with many changes of speed and terrain. It is good for games