This style of lunge is actually slightly better than the forward lunge when it comes to building muscle, partly because it's harder to compensate with the lower back, so your form is better.
If your goal is to build your quads, this reverse lunging style also beats the forward lunge, which is better for glutes and hamstrings.
"Back in the days of being 297 pounds, every workout was brutal; there was no other alternative. That's not the case any more. Have I become soft, like a former all-star playing out a multi-million dollar contract?"