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.
It's best to be active throughout the week, rather than concentrating all of your physical activity in one day. That means 30 to 60 minutes of exercise, five days a week. You can break it up into even smaller chunks: three brief periods of physical activity a day, for example.In order for it to be effective in improving health and fitness, you need to be sure to sustain the activity for at least 10 minutes at a time.Exercise: What You Need to Lose or Maintain Weight. A combination of dieting and exercise is more effective for weight loss than dieting alone.n order for it to be effective in improving health and fitness, you need to be sure to sustain the activity for at least 10 minutes at a time. Exercise: What You Need to Lose or Maintain Weight. A combination of dieting and exercise is more effective for weight loss than dieting alone.