The weight used may be light compared to an exercise like a Squat, but that doesn't necessarily matter. A study in The American Journal of Sports Medicine found that increasing the resistance during the Squat did not increase strain on the ACL, whereas increasing the resistance during the Leg Extension did add strain to the ligament. The force is applied far from your knee, so if you're using 100 pounds, your knee will experience a much greater weight. Also, your body is designed to handle the compressive force of a Squat, so lifting hundreds of pounds is not a problem.
Many people feel having someone to teach psychological skills to an athlete means that the athlete is unstable, or has “mental problems” or is “totally mad.” There is a feeling among coaches and even some athletes is that psychologists are people who provide help to those who are disturbed or maladjusted. They would never consider that a “normal” athlete has the need of positive cognitive assistance of someone trained in psychology and specifically sport psychology. Further, many coaches want only tough minded athletes and they do not want what they think are “head cases.” Coaches have eliminated athletes who had all the necessary physical assets because they did not appear to be able to perform with any degree of consistency or because they “choked” under pressure. They have never stopped to ask if certain skills could be taught to these athletes which would enable them to use their physical abilities even more effectively.
Very few social media users say that finding potential romantic partners or people to date plays a role in their use of these sites—overall more than eight in ten (84%) do not use these sites for that purpose at all. Most of the remainder say that the prospect of romance is only a minor reason. Most differences on this question are quite modest—for example, men are twice as likely as women to say that finding potential dating or romantic partners is a minor reason for using online social platforms (17% vs. 9%) but overall few men say that this is a major factor (just 4% do so).