Even if your main goal is fat loss, you should structure your workout routine with Weight training at the beginning. If your workouts are as tough as they should be, then you’ll need your nervous system to be firing at full speed. If you do Cardio first (AKA Intervals, remember), then you will have taxed it too hard, and will be unable to perform at peak levels.
If you can’t perform at peak levels, then you won’t gain optimal physical benefits, and you won’t reach your goals as quickly.
I’ve seen experts go both ways on this. Is there new data on lifting first, or is it still mixed on what people recommend?
Phil