I have recovered from my cough, and rode the electric bycicle for 25 Min, heart rate up to 120. I tried some Chocalate Endurox R4 after my workout. I felt like my muscles were being regenerated. I seemd to be able to feel the nutrients nurishing my exercised muscles. Maybe it was a psycholgical effect, but I felt it. A lady at the running store smiled and said said she liked Endurox R4. Maybe the repleneshing feeling is what she was smiling about.