The answer is b: No more than 10% of body weight.
Explanation for each option:
a. At least 21% of body weight: This option suggests a relatively heavy medicine ball, which could be too challenging and potentially unsafe for many individuals, especially when performing dynamic exercises like the soccer throw.
b. No more than 10% of body weight: This is the correct option. Using a medicine ball that is no more than 10% of body weight is generally recommended for exercises like the soccer throw. It allows for effective training while minimizing the risk of injury and ensuring proper form.
c. 11 to 15% of body weight: This range is slightly higher than the recommended maximum of 10% and might be too heavy for some individuals, potentially compromising form and increasing injury risk.
d. 16 to 20% of body weight: This option suggests a significantly heavier ball, which is not typically recommended for the soccer throw exercise due to the increased risk of injury and difficulty in maintaining proper technique.
In summary, using a medicine ball that is no more than 10% of body weight is generally considered safe and effective for performing the soccer throw exercise.