Jennifer Lopez, 57, highlighted the importance of strength training for maintaining muscle mass and a youthful appearance as individuals age. The singer, known for her rigorous fitness routine, recently showcased her toned physique after a gym session.

Lopez explained her workout philosophy, which she describes as "smarter, not harder." She emphasizes maximizing workout time, even when limited to 40 minutes. Her routine includes lifting heavy weights, a practice she advocates for individuals starting in their 30s. "Muscle is the thing that burns fat," she stated, underscoring its role in metabolism.

"As we get older, we lose the muscle. So, we need to build the muscle to keep a youthful appearance, you know?" Lopez remarked, detailing her focus on weight training to counteract age-related muscle loss. She also noted that her approach has evolved to be more efficient, with trainers helping her get the most out of her sessions.

This focus on fitness comes amid reports that friends are concerned about Lopez's demanding workload. She has recently taken on a $20 million deal with Dolce & Gabbana, is planning a world tour, and is involved in promoting upcoming films. Some associates have expressed worries about her potentially "burning out," drawing parallels to a past nervous breakdown she experienced in 2002 due to overwork.

Lopez has spoken previously about reaching a breaking point in 2002 while filming the thriller "Enough." She described suffering from a lack of sleep and experiencing a period where she "froze up" and felt unable to function. "I was very overworked and I was doing music and movies and so many things... I did have a kind of nervous breakdown," she recalled in a 2008 interview.

Insiders suggest that Lopez's intense work schedule is a coping mechanism during a period of significant life changes, including her divorce from Ben Affleck and her twins preparing for college. "She is working her tail off because she wants to stay busy, though there is some concern she may burn out," a source told Daily Mail. "But this is how she stays sane during this weird time in her life."