I am not a fan of front lunges either. I don't feel like I can press through the heel so well to come back up--and back. So instead of front lunges, I do walking lunges. With these I feel like I am lunging forward but I bring myself up to the front instead of coming back. Somehow it feels so much more effective to me than any other lunge, back, front, stationary, slow pulses. By walking lunges I mean continually going forward with the same leg for the 16 reps. Granted this does require some space. In fact I only have the space to go 8, then I turn around.