First, exercise for 40 -60 minutes after meals. Exercise is a kind of physical exertion. If you can't keep up with your body's energy, you will feel sick and dizzy. Generally, drinking more water will relieve it!
Second, it may be that your blood pressure is low or your weight is too heavy when you practice squats!
Third, want to make your legs thicker? If you want to reduce the difficulty of your legs, it is much easier to be thicker, such as leapfrog, jogging for less than 20 minutes, and squatting for many times with small strength. Don't stretch your legs if you want to be rough, then eat, eat more, and cooperate with sporting goods! Protein powder, muscle building powder, creatine, etc. (BSN's good) Finally, sit after exercise, and usually stand more and sit less!