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I am a 21 year old male weighting 99kg. I already have my diet managed, but it is a more weight loss orientated diet currently (I understand about needing to eat more to gain muscle etc.)
I am currently doing cardio with a duration of 60-90 minutes.
How can I incorporate about 45-60 minutes of weight training in my program to meet my overall goal of becoming lean, built and building a better overall fitness?
You might want to try one (or more) of these alternatives:
Barbell complexes
This is what I use for warmup. My favorite is the bear complex. The video is worth a million words, but in short, you start with the bar in front of you. You power clean it into a front squat position, do a front squat, push press it into a back squat position, do a back squat, then push press it back to the floor in front of you.
I use a relatively light weight, because I do typical 8-12 rep weightlifting exercises afterwards. However, you can use slightly heavier loads to mix cardio and weight-lifting at the same time.
Circuits
In circuit training, you do one set of one exercise, then immediately do another set of a different exercise, etc, until you're back to the first exercise, then repeat. For example, you might do one set of squats, then one set of bench press, then one set of pull-ups, then one set of standing press, then squats again, and so on, until you've done 3 sets on each exercise.
Typical weights+cardio solution
Another alternative is to do a typical weights training program which lasts 45-60 mins per workout, like Starting Strength, and add 30-45 mins of cardio after. This separates the weights and the cardio parts, but it's what most people do.
It's not a very scientific answer, but I hope it answers your question all the same. You need to do whatever you most want to improve on first. If you do cardio for 60 minutes before working out, your muscles will be fatigued and you'll have consumed much of your body's energy reserves, and your weightlifting will suffer. The same applies if you lift first, and then run.
Strategies that others have used would include splitting your workout up by time of day (run in the morning, lift weights at night), or splitting up by days (lift weights M/W/F, run on T/Th/Sa). Both of these options will have an effect on your recovery, however.
I would encourage you to just experiment, and see which kind of programs helps you the most. There's no one right answer to this question.
It is far more usual to do heavy work first and fat loss-oriented cardio afterwards.
There are two good reasons for this:
Heavy lifting is dangerous when fatigued. It is best to do it while sharp and fresh.
The goal of lifting is to force a bodily adaptation. In order to do this, you must be putting maximum effort into the lifts. It is impossible to put maximum effort into your lifts if you've depleted your glycogen stores with cardio.
Meanwhile, cardio is not as significantly impacted by having trained first.
