Easy only. Stop watching/listening to BS workout like crunches.

Eat more clean diet cause lesser calories and then move more doesn't matter what activities.

Weigh yourself daily in the morning. If drop 0.5kg per week then u progressing well.

It's not one day work. Give it a year or two consistent work daily.

i can see a few experienced guys commenting but usually those that ask this type of questions are seeking for shortcut or easy way such as those nonsense crunches & drink lemon juice in the morning kinda BS.