Losing weight is a professional project of a fitness club. The purpose of people going to clubs is generally to reduce fat, shape, beautify, gain muscle and reduce stress. Like your brother's height, 80KG is the standard weight, so it is ok to go to the club for exercise through professional equipment training, but you should stick to fitness, as long as you are not afraid of hardship, keep good frequency, sleep and diet, and consult the coach of the club more. Ensure that the three elements of sleep, diet and frequency will meet your requirements. After successful fat reduction, the natural muscle content will increase and his muscle shape will be revealed. There is no problem with the theory, and the remaining problem lies in your brother's own perseverance. You don't have to pay for a personal trainer. The cost is too high. You can ask him to give you a diet suggestion and recipe first. This is a free supporting service when you apply for a card. It's better to say it in advance and write it in the card agreement.

If you still don't understand, keep asking.