Generate an explanation for the given claim using the provided supporting material from the paragraph. Please consider the following points while generating an output. 1) The claim will always have supporting proof in the paragraph, and the paragraph will have a clear point of view supporting the claim. 2) There can be instances where direct correlation to the claim is not available. Make use of the sentences in the paragraph to provide a corresponding output supporting the claim. 3) The explanation should be at least one and at most twelve sentences long.
One example: Paragraph: "Although the story didn't cite the cost of appendectomy emergency or urgent surgery and we wish it had, we nonetheless will give it a satisfactory score because it at least cited what the editorial writer wrote, ""A secondary benefit is the savings to the hospital generated by minimizing staff and anesthesiologist presence late in the evening and during the wee hours of the morning."" As with our harms score above, although the story didn't give absolute numbers, in this case we think it was sufficient for it to report that ""The scientists found no significant difference among the groups in the patients' condition 30 days after surgery or in the length of their operation or hospital stay."" Although the story didn't give absolute numbers, in this case we think it was sufficient for it to report that ""The scientists found no significant difference among the groups in the patients' condition 30 days after surgery or in the length of their operation or hospital stay."" Despite running less than 300 words, this story did an adequate job in explaining the quality of the evidence, including pointing out limitations. No disease-mongering here. The story meets the bare minimum requirement for this criterion in that it at least cited what an editorial stated. The focus of the story was on a study comparing emergency appendectomy with surgery done up to 12 hours later or beyond. This is the whole focus of the story and one we applaud when it begins: ""Appendectomy is the most common emergency surgery in the world, but it doesn't have to be."" There were no claims made about the novelty of this research, and we may have wished for a bit more context on this. Nonetheless, the potential for guiding future care decisions was made clear. Not applicable. Given that the story only pulled excerpts from the journal article and the accompanying editorial, and didn't include any fresh quotes from interviews, we can't be sure of the extent to which it may have been influenced by a news release.". Claim: Some appendicitis cases may not require 'emergency' surgery
Solution is here: We really don't understand why only a handful of mainstream news organizations reported this story. (At least in what we found.) The most common emergency surgery in the world. Rushing to emergency surgery may not carry any benefit. Waiting a few hours may be safer and less expensive. Why is that not a story? We applaud USA Today for finding time and space and clearly it didn't need to free up much space to do a good job telling the story. The story explains that as many as 300,0 appendectomies are done each year in the US. That figure alone explains why this is an important study to report.
Explanation: The output is an analysis of the claim while considering the paragraph as a reference. The output highlights the key features presented in the paragraph and explains the claim accordingly.

Now, solve this: Paragraph: Studies have shown that even a 90-year-old can build muscle, so the half-century mark is a good time to retire joint-stressing high jumps and to start lifting dumbbells to build strength. Dr. Wayne Westcott, co-author of the book "Strength Training Past 50," said maintaining lean body mass becomes harder with ageing. "The average man in good shape is about 85 percent lean weight, organs, blood, bones, muscles and skin, to 15 percent fat. The average healthy woman has a 75/25 ratio," said Westcott, fitness research director at the South Shore YMCA in Quincy, Massachusetts. "It's more challenging with age but if you do strength training you can maintain your lean muscle to about age 70," he said, adding that an older woman who doesn't resistance train will lose up to 10 pounds of lean mass per decade. Westcott places equal value on cardiovascular training. "We recommend approximately 20 to 30 minutes of resistance exercises two to three times a week. Then try to have an equal amount of aerobic activity four to five days a week," he explained. Westcott added that older adults, who are hitting the gym in increasing numbers, might want to avoid explosive, high velocity activities, such as high jumps. In 1990 there were 1.9 million health club members aged 55 and above, while in 2012 there were over 10 million, according to a 2014 report by the trade association IHRSA (International Health, Racquet & Sportsclub Association). Dr. Barbara Bushman of the American College of Sports Medicine said regular physical activity, rather than a sedentary lifestyle, has the potential to minimize the physiological changes that occur with age and inactivity, in addition to limiting the progression of chronic diseases. "Older adults can benefit from exercise, and although absolute improvements may be less than for younger adults, relative increases can be similar," Bushman said, adding that older adults may take longer to make improvements. At 54, Florida-based fitness trainer and wellness coach Shirley Archer noticed that if she did not weight train she lost lean body muscle at a faster rate. She also found it harder to get it back. Happily for Archer, who has enjoyed running, cycling and hiking, her endurance activities remain unaffected by her aging. "I feel that I have not lost any endurance," said Archer, author of the book "Fitness 9 to 5: Easy Exercises for the Working Week." As people age, she explained, they lose muscle fibers that produce quick powerful bursts before fibers that are engaged in endurance activities such as running or cycling. She said that is why older athletes, who cannot physically compete against younger athletes when it comes to strength and power, can remain competitive in endurance sports. The ageing exerciser also faces longer warm-up and recovery times, as the body is stiffer and slower to heal, Archer said. And the burning of fewer calories means paying even more attention to diet. Staying hydrated is also important. "We need to be sure to hydrate even if we don't feel particularly thirsty," she said. "Hydration will keep all systems working much more efficiently and even help keep our thinking clear." Claim: Tweaking an exercise routine to stay strong after 50.
Solution:
People turning 50 may want to consider tweaking their exercise routines because as they age stiffer joints, slower recovery from injury and the loss of lean body mass are among the perils facing the youngest baby boomers, fitness experts say.