I know the typical answer id take this and take that and Im sure many work but if your workin all your other muscles you should work the one that keeps you alive,,,cardio cardio!!! Start at what u can handle and build and add just like you would with strength, heres the deal,,,what controls ur bp,,,well ur cardiovascular system, plain and simple,,,work it,,strengthen it,,,,so before of after ur workout? Thats up to you,,,some, like me like it before,,,Im pumped and ready to go,,some like it after,,want the burst on the strength,,,try both and withing a few weeks you will see a diff. Also,,,take care of your body,,,eat right,,keep away from salt and bad fats,,,dont forget,,your heart keeps you alive,,it should be part of your workout and it will most def help your strength training too,,,much faster recovery between sets