While doing a 30- to 60-minute workout once a day is great, you won't burn tons of calories if the rest of the day you're sitting at a desk. Focus on increasing NEAT (nonexercise activity thermogenesis), which is the calories you burn moving around throughout the day (not through exercise). Increasing NEAT will increase your metabolic rate, which will burn more daily calories and help you lose weight.
If you work at a desk, make a point to get up and walk around a few minutes every hour, or do some quick bodyweight exercises or stretches. Anna Victoria, an NASM-certified personal trainer and the creator of the Fit Body app, said that taking a 30-minute walk during your lunch break or after dinner can help you see fat-loss progress.
If you want to encourage more moving around, wear a pedometer like a FitBit to keep track of your steps. It'll challenge you to get in at least 10,000 steps a day.