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 Should You Exercise and How Often? Aim for at least 150 minutes a week of moderate-intensity activity (such as brisk waking). That amounts to about 30 minutes a day at least 5 days a week. If you're just getting started, you can slowly build up to that. In time, you can make your workouts longer or more challenging. Do that gradually, so your body can adjust. When you work out, keep your pace low for a few minutes at the start and end of your workout. That way, you warm up and cool down each time. You don't have to do the same exact thing every time. It's more fun if you change it up.