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.
5. Work up to exercising at least 30 to 45 minutes per day, 4 or 5 days per week. Depending on your level of fitness, you may want to work up to that gradually. Lesser amounts of exercise are adequate if your goal is longevity or a healthy body and mind.. Work up to exercising at least 30 to 45 minutes per day, 4 or 5 days per week. Depending on your level of fitness, you may want to work up to that gradually. Lesser amounts of exercise are adequate if your goal is longevity or a healthy body and mind.