Weight Loss tip for overweight people

One key way to get a six pack ab is not do do crunches madly , but to focus on burning more calories .I've seen over weight people in gym doing biceps curls daily just because they want big biceps .But whats the point in having big biceps with a big belly .So if you workout your core musculature you will burn more calories and increase your lean muscle mass and eventually burn more fat.So the next time you see overweight people doing crunches ,biceps curls stop them and ask them to go for exercises that burn more calories like squats ,bench press , shoulder press etc instead of focussing on muscles like biceps ,triceps,traps .