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.
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Sled drags are great for quads, but you can also use them to get in some bonus back work by pulling your elbows down and back.
A back exercise. A core strength exercise. A much-tougher-than-it-looks exercise. Try it!
Doing a back workout once a week isn't going to cut it. You need to crush it and crush it hard several times a week.