 [ Symptoms ] why do i get so tired after exercising  i have not gone out and done physical activity for about a month so i just went out for a nice and easy power walk for about 50 minutes i come home and suddenly i just feel sluggish and exhausted i do not starve myself i eat when i am hungry and when i need to eat i get super tired and when i come home i just knock out because i get so tired i do not like to exercise when i have school it is been affecting my health and my body i really want to exercise daily help please <negative_smiley> [ Disease ] maybe you could start with smaller bouts of exercise instead of 50 minutes start walking for 5 minutes per day and as you feel stronger increase to 10 and so on make sure you eat something about 30 minutes before exercising like a banana yogurt or granola bar if you are low on glycogen stores of carbohydrates in muscle it could increase your tiredness after exercise if you continue to feel tired without a good reason visit your healthcare provider for a full blood work up certain nutrient deficiencies like anemia can also make you tired