​To lose weight and or change your body composition means you have to be willing to mix things up. 

A walk at 60% heart rate for 30-60 minutes a day is not going to cut it. You have to be willing to sweat, to pant, to feel the burn. 

Mix it up ... use HIIT (High Intensity Interval Training) training or Tabata intervals  ... interval training is a great way to lose fat but everyday would be too much ... and could lead to overuse injuries. 

I suggest you mix up your intensities between high and low as well as mix up the type of movements you do. Cross training helps avoid injury. Always include functional activities inside your workouts and warmups or cool downs.  

For example, you could do one day hard, one day easy. You could include heavy weightlifting, restorative yoga, and cycling at various intensities as part of your weekly routine. 

Variety, it is the spice of life!