With one hour a week, working Chest and Back is extremely difficult. Arnold is well known for doing that stuff back in his Mr. Universe days; but these are two large groups of muscles where you could passed out while doing them.
Anyways, try a full body workout in your case, more reps and lighter weights. With one hour a week you can't do much. Packing more weight on select areas of your body could be dangerous so please proceed cautiously.
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