Training with Sal- footwork drills with shuttles

My footwork is horrible. Lots of weaknesses exposed. I saw a small improvement in my foot positioning on my lunges. A few times I lunges with my left leg and even turned around facing backwards at one point? These drills also pushed the endurance in my lungs big time. My heart rate was fine though, I was around 115-120 and peaked at 135 so it wasn’t too bad in that area and my legs were not tired ...