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Artificial intelligence-powered tools like ChatGPT have mesmerized us with their ability to produce authoritative, human-sounding responses to seemingly any prompt. But as more people turn to this buzzy technology for things like homework help, workplace research, or health inquiries, one of its biggest pitfalls is becoming increasingly apparent: AI models sometimes just make things up.

A study has found the best exercises to lower blood pressure, so get ready to go to the gym. Research published in the British Journal of Sports Medicine and conducted at Canterbury Christ Church and Leicester universities, compared the efficacy of different forms of exercise on reducing blood pressure and found that “isometric exercises” – which involve engaging muscles without moveme are your best bet. That means it is time to hold a wall-sit, or plank for ages. Fun times. The study examined 270 randomised controlled clinical trials, involving 15,827 participants, on the effects of different types of exercise on resting blood pressure. It even found that these isometric techniques were almost twice as effective as government recommended exercises, aerobic activity like cycling and walking, though they found these other forms of exercise were effective too. Reducing blood pressure reduces your chance of stroke, heart failure, and other issues. Sign up to our free Indy100 weekly newsletter Over-40s are advised to have it checked every five years. Treatment often involves medication but patients are also advised to eat healthily, reduce alcohol intake, stop smoking and exercise regularly. Jamie O’Driscoll, a reader in cardiovascular physiology at Canterbury Christ Church university and senior author of the report, said in isometric exercises the muscle remained contracted but did not change in length. This static contraction could squeeze the vessels that supplied blood to the working muscles – which reduced the flow of blood to the muscle during the exercise and therefore oxygen supply to the muscle. When the muscle relaxed afterwards, it caused a large flow of blood through the vessels (this was different to other modes of exercise) and was likely to be the trigger driving these greater improvements in blood flow regulation. “Performing 4 x 2 minutes of wall sits, with 2-minutes’ rest in between, three times per week, is an effective way to reduce your blood pressure,” said O’Driscoll. “They should be done alongside other exercise modes, to provide the maximum range of exercise choices rather than limiting them.” Dr Kush Joshi, a sports and exercise medicine consultant and fellow of the Faculty of Sport and Exercise Medicine, welcomed the study’s findings, but questioned how easy it would be for patients to do. “The reality is a significant proportion of the population will not be able to do a plank or wall sits, and furthermore may not enjoy these types of activities,” he said. “Solutions need to be found to make these exercises accessible to all individuals with elevated blood pressure, and the study should provide impetus to policymakers to make exercise the bedrock of treatment of not only high blood pressure but other medical conditions and so to reduce the burden of medication for the population.” Joanne Whitmore, a senior cardiac nurse at the British Heart Foundation, said it was encouraging to see the benefits of other forms of exercise, as well as aerobic exercise. “We know that those who take on exercise they enjoy tend to carry on for longer, which is key in maintaining lower blood pressure.” But she said it was important to make lifestyle changes too, such as losing weight, eating more healthily and reducing alcohol consumption. Have your say in our news democracy. Click the upvote icon at the top of the page to help raise this article through the indy100 rankings.

Bryan Johnson, the multimillionaire tech and science entrepreneur who is trying to reverse his biological age, has taken the next odd step in his attempt to achieve this. Johnson, who has already spent millions of dollars every year trying to turn back the clock, has now revealed that he’s injected himself with his teenage son’s blood. The multimillionaire recruited his 17-year-old son, Talmage, and his 70-year-old father, Richard, for a trigenerational blood transfusion. The family travelled to a clinic in Dallas, where Talmage and Richard gave a litre of their blood for it to be converted into a batch of plasma. Bryan then donated a litre of his blood to Richard. Sign up to our free Indy100 weekly newsletter Claims that plasma from younger bodies can benefit older people’s health have been around for a while. Previously there have been studies carried out on mice, however experts say the results are inconclusive. The FDA does not recommend the blood infusions Bryan has done. "We have not learned enough to suggest this is a viable human treatment for anything." said Charles Brenner, a biochemist at City of Hope National Medical Centre in Los Angeles. The 45-year-old has previously spoken about his lifestyle, and told the BBC that there have been improvements in different parts of his body. "my left ear is 64, my fitness tests say I’m 18, my heart is 37, my diaphragm strength is 18," he said. Bryan’s mission to reverse the ageing process has been titled ‘Project Blueprint,’ and involves following a strict diet, sleep, and exercise routine. Have your say in our news democracy. Click the upvote icon at the top of the page to help raise this article through the indy100 rankings.

Fewer employers looking for workers means 270 employees at job search site ZipRecruiter will soon be out of a job.