Men lose weight more easily than women! You are on a diet and spend so much time doing sit-ups! Fitness, if possible, you can go to the gym, where there are a lot of equipment and professional coaches. I used to work in it! Get to the point, do sit-ups and push-ups, one group 10- 15, rest for 30 seconds, continue, and do five groups-10. Strength training is the dumbbell you mentioned, and it is also done in groups. Don't do it all at once. Not good, but it will hurt your health. Grasp it according to your own strength! You said you were too busy to finish these things in half an hour-an hour. For the sake of health, stick to it! ) I hope I can help you more!