Regressing “It has been over half a month since my last badminton training session. I'm going to take it seriously this time," I muttered to myself as I walked into the badminton arena, getting ready. The training commenced, and I was the first one on the court. Shuttle after shuttle flew towards me, demanding continuous movement as I executed backhand pushes and forehand jump smashes without stopping. As the coach's third set came to an end, I felt the fatigue setting in. After pushing and smashing through four or five sets, my first session was over. My limbs felt sore and weak, and I could hardly breathe. Collapsing onto the bench, my body was drenched in sweat. I gulped down the water, struggling to catch my breath. Attempting to rise, my legs failed me, forcing me to sit back down. Reflecting on a similar training session a month prior, when I was practicing jump smashes, I finished playing seven or eight sets of shuttles without resting and didn't feel half as depleted as I do now. Why is this happening? This led me to realize that a lack of practice will inevitably result in regression when it comes to mastering a skill.