ya shorter limbs do help, i have longer arms a 6'span so i shouldnt be as good in benching as i am though, but helps in deads
this guy lifted at my last meet; shawn frankl as a light 220
1060 squat 875 Bench 780 Deadlift 2715 Total
he is about 5'5"
though i gained muscle lifting heavy, and loss fat by my diet, you can lose fat quicker with diet then upping your cardio.
i dont really do cardio unless you count repping 345x10 in squats, that make me feel like i have ran a few miles.