172cm, 62kg, this should be considered as the standard weight. The key is less muscle and more fat (it shouldn't be serious). In your case, bodybuilding should have an effect soon.

The way to exercise long muscles is once every two days, and the cumulative time should not exceed 45 minutes each time. You can do two push-ups, horizontal bar pull-ups, parallel bars arm flexion and extension, dumbbell (barbell) bench press. Don't arrange more than two kinds of each part at a time, two to four groups, eight times in each group. If you can do more, increase the difficulty or weight (not as good as push-ups to lift your feet or lift heavy objects, and be sure to have a friend supervise you when you start lifting heavy objects).

Weight loss exercise can be carried out every day for at least 45 minutes at a time. Jogging works best. If you focus on reducing your abdomen, you can practice sit-ups. You can do it 50 times in a row, and the key actions should be standardized.

In terms of diet, if you want to gain weight, you can eat lean milk properly and eat less fat and dessert. It will soon be effective if you persist for a while.