It has the effect of losing weight. There is no need to change other ways. You are doing very well. Let's make some suggestions. Don't lift the dumbbell with one action, practice with multiple actions, and you must practice the big muscles such as legs, back and chest, not just your arms. Hiit itself is quite good and does not need to be changed. Do not eat high-calorie food, fruit instead of rice and snacks in your diet. You will definitely lose weight.