You said you can lift dumbbells, do push-ups and do sit-ups, but it's really awesome! It shows that you have the foundation of exercise and it is not difficult to lose weight. Exercise starts with lifting dumbbells for 20 minutes, doing push-ups and sit-ups, and then doing aerobic exercise (this is better than simply doing anaerobic exercise to reduce fat). Persistence will have an effect (if it is reduced, there will naturally be muscles where there are muscles). There are various schemes: one week of arm plus your favorite aerobic exercise, one week of push-ups plus your favorite aerobic exercise, and one week of sit-ups plus your favorite aerobic exercise. In this way, the arms, chest and abdomen are trained.

I suggest training every other day, because it is more scientific, easier to persist and more effective. At the same time, the time is limited to 1 hour, or it depends on your physical load. In short, don't make yourself too tired. Two or three months will have a good effect, and the time should be before taking a shower. Taking a comfortable hot bath after exercise is helpful for blood circulation, relieving exercise fatigue, then falling asleep and making the body function work. Both cells and muscle tissues can get a relaxing rest and regeneration cycle, which will definitely have an effect on slimming and fitness, and the body will naturally be healthy. The next day will not be listless, on the contrary, full of energy. Eat protein (chicken, beef, salmon), drink more soy milk, and add bananas. Bananas are rich in vitamins, very nutritious, and also great fruits, which help muscle growth.

Having said so much, I just want you to have a healthy and scientific method. Let you achieve your goal in the fastest and safest way.

I wish you success!