Early warning of adverse reactions to fitness and a fitness plan for the entire life cycle: from peak at age 20 to reshaping at age 60 [i]

Not all exercise needs to be done every day; there are times when our bodies shouldn't exercise.[i] 1. Feeling fatigued: If fatigue persists for 2-3 days or longer, it may be a result of overexertion. In this case, you need to temporarily stop exercising to allow your body to fully recover.[i] 2. Muscle pain: Muscle pain after exercise is normal due to lactic acid buildup. However, if the pain lasts for 3-4 days or longer, you should reduce the intensity of your exercise. If it is severe, you should stop exercising immediately and get a massage.[i] 3. Loss of appetite: This is likely due to excessive exercise, overstimulating the body and inhibiting the digestive center in the brain.[i] 4. Nausea and vomiting: This is mostly caused by excessive exercise, insufficient blood supply to the brain, or stopping immediately after strenuous exercise.[i] 5. Headache and dizziness: This usually occurs when doing some strenuous activities and is mainly related to changes in blood pressure and low blood oxygen levels.[i] 6. Thirst: Thirst after strenuous exercise is normal, but you should pay attention to replenishing fluids before, during, and after exercise.[i] 7. Mental Depression: The initial purpose of fitness should be to relieve stress, but if mental depression occurs during exercise, one should actively adjust oneself and reduce the amount of exercise[i]. Maintaining a regular exercise routine is a good habit, but some incorrect habits during exercise may affect physical health[i]. First, exercising until drenched in sweat: Many people believe that only when drenched in sweat do they feel they have had a sufficient workout, but this can lead to cramps, dehydration, and other sports injuries[i]. Second, choosing only one type of exercise: Repeating the same exercise every day will cause some parts to feel "fatigued," while other parts will not get exercise; it is best to rotate between different types of exercises[i]. Third, exercising while flipping through magazines: One cannot do two things at once; listening to music is more suitable than reading[i]. Fourth, exercising on an empty stomach: This is tantamount to driving a tank without fuel; exercising in the morning, especially on an empty stomach, is particularly inappropriate[i]. Fifth, blindly imitating others without understanding: One should consult a coach for the correct form of exercise to avoid injury[i]. Male aging is inevitable; should we just let it proceed unchecked? No[i]. Around 20 years old: Sports medicine refers to this age group as the "record-breaking age group"[i]. During this period, bodily functions are at their peak, with heart rate, lung capacity, and bone agility all reaching their optimal levels [i]. From a sports medicine perspective, insufficient exercise during this period is more detrimental to health than excessive exercise [i]. People in this age group can engage in exercise of any intensity, which can help build up resources for future health [i]. The heart can increase its pumping capacity through endurance training [i]. Exercise can be done every other day for 30 minutes each time to enhance physical strength, with a load of 60% of maximum muscle strength, ensuring that major muscle groups (chest muscles, shoulder muscles, back muscles, etc.) are exercised [i]. In addition, 20 minutes of cardiovascular system training is also necessary [i]. Around 30 years old: People in this age group have surpassed their peak bodily functions, and oxygen uptake, which is very important for endurance, will gradually decline [i]. At this time, joints often make cracking sounds, which is a precursor to joint disease [i]. To maintain joint flexibility, more stretching exercises should be done, and attention should be paid to cardiovascular system training [i]. Doctors recommend that people over 35 years old have an electrocardiogram (ECG) before exercising [i]. In your 40s: Compared to your 20s, muscle trainability has decreased by 25%, physical strength declines, and weight gain begins [i]. Weight gain is related to a decrease in total muscle mass and reduced fat consumption [i]. Choosing exercise should not only help maintain a good physique but also prevent common age-related diseases such as hypertension and cardiovascular disease [i]. Exercise twice a week, on Tuesdays and Fridays, including 25-30 minutes of cardiovascular exercise [i]. In your 50s: Suitable exercises include swimming, weight training, rowing, and golf [i]. Swimming effectively strengthens overall muscle elasticity and is less strenuous than land-based exercises; weight training builds strong muscles, increases bone density, and improves other athletic abilities [i]. Golf can improve focus and self-discipline [i]. Over 60s: It is recommended to do more walking, ballroom dancing, yoga, or water aerobics [i]. Walking strengthens the legs and prevents osteoporosis; yoga improves overall flexibility and balance; water aerobics primarily enhances muscle strength and body flexibility, making it suitable for obese or frail individuals [i]. These functions can invigorate people and are a good way to help older adults maintain a youthful mindset [i].