Heart supplies blood to all the parts of the body and its stars beating in us when we all are in our mothers womb. It supplies blood to the body as per the need. When you exercise the muscles require more blood a d to suffice that need the heart beasts fast. Increased demand of blood requires the heart to beat more. The blood pressure also increases. This is normal phenomenon in the body.
Next Steps
After exercise allow the body to rest and let the heart Rate come down this called cooling down of the body
Health Tips
Please do a warm up and cool down before and after your exercise as its a health habbit to follow and doesn't put any pressure on the body and heart and it gives longevity to all the body cells including heart and prevents it from reacting abnormally to any major events in one's life.