As soon as you start exercising, the body has positive reactions. Heart rate and breathing rate increase, blood vessels dilate, helping to deliver more oxygen and nutrients to the muscles. This is the starting point for the body's adaptation process to exercise.
At the same time, the feeling of muscle aches after the first few training sessions is common. According to expert Micky Lal - an expert in clinical health education (USA), this is a sign that muscle fibers are showing "micro-damage" and are being regenerated to become healthier.
Combined with a suitable diet, it takes about 3-4 weeks of regular exercise for many people to start to clearly feel the improvement.
At this time, the body becomes more flexible, endurance increases, and daily activities such as climbing stairs or carrying heavy objects also become lighter.
The reason is that the cardiovascular system works more efficiently, and the body's ability to use oxygen is significantly improved.
Changes that can be seen such as fat loss or muscle gain often come later. Usually, it takes several weeks to several months to notice a clear difference, depending on the level of exercise, diet and each person's constitution.
The most important factor is still regularity. Intermittent training is difficult to achieve clear results compared to maintaining a stable routine.
Each type of exercise has a different rate of effectiveness, such as when the goal is strength training, the body can feel stronger muscle groups after 2-3 weeks, and significantly increase muscle after 4-8 weeks.
As for cardio, improving endurance is quite fast, after only a few weeks, as well as with flexible exercises, the body becomes more flexible after only about 2 weeks if maintained regularly. Experts recommend combining all three forms to achieve comprehensive effectiveness.
With the goal of weight loss, the recommended safe rate is about 0.5-1 kg per week. The rapid changes in the first week are usually just fluctuations in water in the body.
Meanwhile, muscle gain takes longer, usually from 4–8 weeks to be noticeable, with regular exercise and sufficient nutrition.
Many people give up because of too high expectations in a short time. However, exercise not only changes the body but is also a process of adjusting living habits.
Instead of changing the entire plan, you should review core elements such as: Training frequency, diet, sleep and recovery.
