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.
Time. You should do between 225 and 420 minutes of weekly exercise in order to see the most weight loss results. You can accomplish that goal by bike riding for 40 to 60 minutes each day. An obtainable goal is to burn 400 to 500 calories each day, so you will lose one pound a week.utdoors. If you struggle with 60 minutes of exercise, you may find that bike riding outdoors helps to quickly pass the time. The changing scenery gives your mind something to focus on other than the physical activity. You can ride on flat roads, hills, off road, or on a track to provide workout variety.