Cross-trained athletes have strong muscles to help them provide enough force to accelerate at high speeds while pushing large weights . After training for two weeks, an athlete gets stronger and can apply more force to the weight. If he can now push the weight 75 meters in 25 seconds, what is his average speed, in meters per second?

You exhale co2 which is produced during cellular respiration.  co2 combines with the water in your blood's plasma to make up one half of the body's most important buffer pair, carbonic acid.  the more physical activity you engage in, the more co2 your body is producing.  you can see this by putting some of the cabbage indicator in a glass and then blowing bubbles into it through a straw.  can you see a change in the color of the indicator?