Capítulo 271: Michael's Celebration

Gregory already took the pill, and he was more energetic now and his breathing became even slower and more stable. Which proves that the pill has successfully strengthened his heart muscles.

Fein had taken one himself. After all, what's good for the heart is good for the brain. The health of our brain is largely connected to the health of our heart. 

The more efficient the heart is, the more it can provide blood to the brain. That's why cardiovascular exercise is also considered good for the brain. The human brain requires q to function. Blood is the one that delivers oxygen from the rest of the organs, including the brain.