Consider speaking with a doctor before taking peptide supplements if you’re pregnant, breastfeeding, taking any medications, or have a certain health condition. There may also be a risk of contamination if people use non-sterile needles to inject GHS. This may explain their popularity as an alternative to HGH among bodybuilders. Some people claim that GHSs offer many of the same benefits as HGH with fewer side effects. Back in the 1980s, HGH was a popular performance-enhancing drug among various recreational and professional athletes, including bodybuilders. Bodybuilders are typically interested in changing their body composition as quickly and efficiently as possible. Endurance-based exercises, like cardio, can potentially reduce testosterone. The athletes studied are typically in good physical condition, with a lean body and no symptoms of low testosterone (which doctors say is often more important than your actual levels). A small 2016 study found that obese and overweight men saw a boost in their T levels when they increased their physical activity, more so than when they solely restricted calories. Still, some exercises, especially weightlifting, can temporarily boost testosterone. EXERCISE DOES IMPACT testosterone levels, but research suggests that the actual effect depends on several factors. Resistance training has the strongest evidence for temporarily increasing testosterone, while HIIT may also trigger increases, particularly in men. Exercise can influence testosterone levels, but the effect depends on the type and intensity of your workouts. When you think of the gym, you think about people that are already more fit. During her first year of college, Elisabeth Bradley was inspired to try weightlifting after she followed a woman tracking her fitness transformation on social media, one barbell at a time. "If you’re fasting with the goal of losing fat but gaining muscle, that’s not going to happen," Horowitz says. When it’s best to eat (or not eat) in relation to exercise remains up for debate. "The trade-off though is that you also are at risk for less muscle protein synthesis." I would say people who are fasting should strength train," Horowitz adds. Testosterone is often described as the primary male sex hormone, but everyone produces it. This is particularly valuable for beginners or those returning to training after a long break. Eccentric tempo work, isometric holds and high-rep sets taken close to failure all create strong muscle-building signals without relying on heavy loads. As recovery capacity declines with age, the balance between stimulus and fatigue becomes more important. It’s a strategy best suited to those with solid technique and experience, but it can be a powerful tool for long-term progress. The gym is the anchor – but staying strong, lean and healthy depends on what you do the rest of the week. Many of our clients will target 10,000 steps per day to increase their NEAT (non-exercise activity thermogenesis) which helps accelerate fat loss. Either way, conditioning is a powerful tool – not just for heart health and fat loss, but for keeping your training sharp, sustainable and progressing year after year. As cardiovascular fitness declines with age, staying fit becomes essential not just for health and longevity, but also for improving recovery and performance in the gym. The actor has a bloody good time in 'Ready or Not 2.' Thanks to social media saturation and crafty supplement marketing, young boys are pushing weights and chugging shakes to get strong. Stay on top of latest health news from Harvard Medical School. Sign up for HEALTHBeat and receive trusted health information delivered right to your inbox. Get the latest in health news delivered to your inbox!