It is often said that if a man is good or not, you can tell by looking at his legs, and this is true.

Thighs are the source of strength, leg muscles account for 60% of the weight of the whole body muscles, need to exercise regularly. Some data show that people who do not exercise their leg muscles, when they are 70 years old, their leg muscles will be reduced to half of what they were when they were 40 years old, which means that it is equivalent to carrying a person.

In addition, practicing legs is essential for muscle building, fat loss and also improving athletic performance, in addition to improving men’s testosterone levels, which maintains muscle strength and quality, maintains bone density, refreshes the mind and improves physical performance and other effects. Whether it’s building muscle or burning fat , even sex life is affected by it.

1. Waist and leg strength and kidney function
According to Traditional Chinese Medicine (TCM), “the waist is the capital of the kidney”, and the strength of the waist and leg muscles directly reflects the strength of the kidney. Kidney is the main reproductive and vitality, waist and knee weakness, lower limb weakness is often accompanied by sexual dysfunction, such as lack of erectile hardness or premature ejaculation. Modern anatomy has found that the pelvic floor muscles (PC muscles) and the deep muscles of the hip joint (such as the iliopsoas muscle) work together to maintain erectile stability, and their strength can be indirectly strengthened by squatting and other leg movements.

2. Leg meridians and blood circulation
The three yin meridians (liver, spleen and kidney meridians) and the three yang meridians (stomach, gall bladder and bladder meridians) are located in the lower limbs, and those with well developed leg muscles have a higher degree of meridian smoothness, which helps to improve the efficiency of penile corpus cavernosum congestion. Studies have shown that quadriceps muscle strength is positively correlated with peak penile blood flow velocity (PSV) (r=0.42, p<0.05).

3. Skeletal muscle metabolism and sex hormone secretion
Training of the large leg muscle groups (quadriceps and hamstrings), which account for 60% of the total body muscle mass, significantly stimulates testosterone secretion. After a single high-intensity squat, serum free testosterone concentration can be elevated by 28%-35% and last for 48 hours. Long-term regular trainers have baseline testosterone levels that are 15%-20% higher than sedentary people, which directly correlates with libido and erection quality.

4. Exercise performance and cardiorespiratory fitness
Deep squat capacity (e.g. 1RM weight) reflects cardiorespiratory endurance and motor nerve coordination. Men who can perform a squat of 1.5 times their body weight generally have a maximal oxygen uptake (VO2max) of more than 45 ml/kg/min, and those with a VO2max of ≥50 prolong sexual behavior by more than 40%. In addition, lower extremity explosive power (e.g., vertical jump height) was linearly related to pelvic floor muscle contraction velocity.