I have to agree with the above if cardio is your sole exercise regime.
Resistance training is far better imo.The health benefits are great and you'll look far better.
Nothing wrong with cardio as a supplement to weights,it will help,however certainly prioritise the resistance stuff.
I have recently started GVT training(German volume training)
It covers muscle building and cv work as it involves performing 10 sets of 10 reps with a constant weight(usually 60% of 1rep max) with 60secs between those sets.
Ive been splitting my workouts over 4 days,every other day.....
mon - legs(squats)
wed - chest(incline db press)
fri- back(deadlifts)
sun - shoulders(overhead press)
Its brutal and needs dedication and plenty of effort but its very effective.
Use this method on compound exercises(squat,deads,press etc.) and I guarantee you'll see quick results.