Workout Update: 654 Cardio/Lift 4 Hybrid: Day 12

On Day 12, I did the 645 cardio routine in the morning, followed by the Legs routine from Lift 4 (a HIIT routine without any lifting) in the evening. I was very sore and tired in the evening workout, so I swapped speed skaters for triple bear and squat jumps for catcher jumps. Even with those modifications, the workout was still challenging, and I tried not to modify any exercises until I absolutely had to.