Weight Lifting for a Fat Guy?

Hi,

I'm a fat guy, (6 ft 0" 280 lbs). I'm down 10lbs from my all time high thanks to giving up sodas and starting to count calories this year. I'm currently aiming for 1800 cal/day.

Anyway, I've been trying to exercise too but obviously can't run/jog without destroying my knees. I can't even walk more than about 10 minutes a day or my shin splints killing me, so I usually stick to Ellipticals and Bikes. I feel like I get good workouts on those machines, with no problem getting my heart rate up into the 160 bpm range for 30 minutes during an average workout.

However, I keep reading that I should be lifting weights. I am honestly clueless about weights. I have never been very athletic and am your typical nerdy/dorky guy. Due to my job I live in hotels for 2/3rd of every month but most hotels have a gym with some kind of cable/pulley "weight machine" and often a set of dumbells. At home I have a decent apartment gym with machines and dumbells.

Is there a guide out there for the kinds of weight training exercises a person in my condition should be doing, or should I just stick to the cardio as a more productive use of my time? I find that I can't really exercise more than an hour per day before exhaustion sets in on my current calorie restriction, so I need to figure out if it's good to spend the whole hour on cardio or if a 50/50 cardio/weight split would be better.

Thanks in advance.

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