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.
What Is the Minimum Amount of Exercise Needed to Stay Fit? Organizations like the American Council on Exercise recommend at least 60 minutes of moderate activity most days of the week for folks trying to lose weight. But one relatively recent study actually compared 3 groups of individuals over a 13 week period. The groups consisted of people who exercised 30 minutes per day, people who exercised 60 minutes per day, and people who didnât exercise at all.