Day 2 on C4 pre-workout. I took it at home and started to feel it on the ride to the gym. Tingly, and it seemed to affect my vision, I couldn’t stop squinting. I could feel myself get immediately impatient and aggressive. It definitely killed the lag time in getting a workout started, but I felt like something was wrong. I warmed up on the stationary bike, and did weight training today with jump rope mixed in to get my heart rate up. I lifted heavier, and after an hour, I started to level off. I cooled down on the bike. Not sure how many calories, but I felt like I put in work.