Lactic acid will build up. That causes a burning sensation.
Lactic acid
Lactic acid is formed by anaerobic respiration, and builds up in the muscles.
Work a good honest day's hard physical labour.
by doing work hard like runing playing sports
No easy ones, just hard, time consuming, and boring, hard work.
Your muscles are growing to make you strong and you've been working them hard
its really hard i need help
Because your muscles are sore after a long day of hard nonstop work.
Muscle burning during exercise is primarily due to the accumulation of lactic acid, a byproduct of anaerobic metabolism when the body uses energy without enough oxygen. As you exert yourself, your muscles require more energy, and when oxygen levels are insufficient, lactic acid builds up, leading to that burning sensation. Additionally, the depletion of ATP (adenosine triphosphate) and the release of hydrogen ions can contribute to fatigue and discomfort in the muscles. This sensation typically indicates that your muscles are working hard and may need a moment to recover.
Bicep curls can be hard for some people because they require strength in the bicep muscles, which may not be well-developed in everyone. Additionally, poor form or using too much weight can make the exercise more challenging.
"Butt crunches" are a type of exercise designed to improve the strength and tone of the "butt" muscles. These are the gluteus muscles on the backside. If you clench the muscles as hard as you can and then relax, you've done a "butt crunch."
Specificity - Choosing a type of exercise that is related to the sport you do. Progression - Gradually progress/increase the exercise you are doing. Overload - Doing more exercise than what the muscles are used do. Reversibility - The muscles slowly decrease in strength due to a stop in exercise. Tedium - Varies of different exercising do prevent boredom. Frequency - How often you exercise. Intensity - How hard you exercise. Time - How long you exercise for. Type - The type of exercise you do.