When P and S waves hit the surface they transform into surface waves. P and S waves are signatures of fracture rock or earthquake. When a fracture occurs it sends energy out i â¦ n all directions. P, or primary wave is the initial large shock of the earthquake. This travels through anything.
Weekly Cardio Minimum. The Centers for Disease Control and Prevention recommend that all adults engage in at least 2 1/2 hours of moderate aerobic activity per week. If you do intense cardio, you can get away with half that time. You may spread your exercise over as many days of the week as you like, as long as each session lasts at least 10 minutes. In addition, the CDC recommends that all adults engage in some physical activity for 30 minutes a day, at least five days a week.
How much cardio exercise you do depends on your current fitness level, exercise history, current health status, and goals. For general health benefits you should perform 30 minutes of cardio activity, 5-7 days of the week.Any activity that increases your heart rate and breathing rate can be considered cardio exercise. If you find that 30 minutes is a little too challenging, start with 5-10 minutes and gradually work up to 30 minutes.f you're doing a moderate-intensity cardio activity/program try to get in 30-60 minutes per day X 5 days/week. If you're doing a more vigorous-intensity cardio activity/program try to get in 15-30 minutes/day X 4-5 days/week.