Rondel King, MS, CSCS, an exercise physiologist at NYU Langone's Sports Performance centre, told POPSUGAR that instead of focusing on isolated exercises like a bicep curl, you should do compound exercises to burn fat and build muscle.
Compound exercises are multijoint movements that work groups of large muscles like squats and deadlifts. If you're wondering why compound exercises are better than isolated exercises for fat loss and muscle building, it's because they elicit a greater energy expenditure, which simply put means you have to work harder to perform them. As a result, you'll burn more calories and fat.
Here's a list of compound exercises you should be doing.