As someone who has focused on leg training for a while, I can say that incorporating exercises like Bulgarian split squats, back squats, and leg extensions has significantly transformed my leg strength and shape. The Bulgarian split squat is particularly effective because it targets multiple muscles in the legs and glutes while also challenging your balance and stability. I recommend starting with 4 sets of 10-12 reps as indicated, adjusting weights so that the last few reps feel challenging but manageable. Back squats remain a cornerstone of any lower body workout because they engage your quads, hamstrings, glutes, and core simultaneously. Using proper form is crucial to prevent injury and maximize results—make sure your knees track over your toes and keep your chest lifted through each rep. Leg extensions isolate the quadriceps, helping to add definition and strength to the front of your thighs. Incorporating 4 sets as part of your routine can create a balanced workout that sculpts the legs effectively. Consistency and progressive overload are key—gradually increasing weights or reps over time accelerates muscle growth. Also, complementing this workout with proper nutrition and adequate rest will help you achieve stronger, more sculpted legs. Don't forget to warm up before and stretch after your workouts to maintain flexibility and reduce soreness.