Try cooling down and relaxing after your practice with this breathing exercise;
Shitali Pranayama: This technique is done by curling the sides of your tongue towards one another and sticking your tongue out through your lips. Inhale through your rolled tongue and exhale out through the nose. Repeat 5-20 times. If you have difficultly curling your tongue, try making a donut shape with your lips instead; inhale through the lips, exhale through the nose. Or sucking in the air over teeth.