Cool, looking lean!
Yeah, I really do firming believe in cardiovascular training immediately after weight training, or on an empty stomach first thing in the morning. This is how I have had my bodybuilding-conditioning preparation completed over the past decade or so.
The more I learn and understand biochemistry, nutrition and anatomy and physiology, I understand how and why this all makes sense for those circumstances to lead to optimal fat-burning. In a nutshell, we basically have about an hour worth of carbohydrate reserves ready to be used and after an hour or maybe up to 90 minutes, we're out of glycogen to be expended as fuel and our body turns to fat as its fuel source. This of course, is why runners and cyclists tend to be so thin, their sport often has them performing for more than an hour and they naturally get into that fat-burning zone.
I mimic this approach to fat-burning as a bodybuilder so I lift for an hour or so, then do my aerobic training then. So even if you don't use weights much, know that anytime you push yourself over 60-90 min and don't refuel during that window with fruit or sugary drink, etc. you'll be entering into a fat burning zone. Combined with general fitness exercises to strengthen and develop abs, and other muscles, you'll get your desired results in now time. Its just how biochemistry works
Keep after it.