Just a point to consider, cardio does not normally warm up the muscles used for a strength workout. While is does increase your heart rate since most do some version of walking or running for cardio it does not activate the muscle groups used for strength work per se. A better warm up for a strength workout is a set of bodyweight calisthenics being sure to specifically activate the muscles used for the strength training programme.
A point to remember is that the body is not designed in such a way that you can split off muscle groups. muscles are synergistic, designed to work together and the more muscles used in a specific exercise the greater the benefit.
It is called WORK-ing out for a reason.
I said getting fit was simple, I did not say it was easy.
Cardio burns calories, strength work burns fat.
Eat well to lose weight, exercise to get fit
You can not build a six pack using twelve packs
Often when we seek a magic bullet for fitness we end up shooting ourselves in the foot.
"I think calories are little germs in food that all moms are afraid of" Dennis the Menace