The best advice (IMO) would be to do an upper/lower split. Don't do every set to failure. Don't do most of your sets to failure. It's counter productive.

The guy that told you to only do 2 body parts because only so much blood can flow to one place or another doesn't know jack. He probably came up with that idea himself.

Doing one body part each week is dumb because you're reducing the cumulative stimulus for growth. It's kind of like the idea of intermittent fasting. Some people eat less frequently because their bodies are very sensitive to nutrients if they haven't eaten in a while, so the nutrient uptake is higher when they do eat. But keeping your body supplied with nutrients throughout the day more than makes up for that. This guy is thinking you that you will recover and grow more from one workout (done once a week) compared to one of the workouts you'd do twice a week. And he's right. But compared to two workouts, he's way wrong.

These numbers are totally arbitrary and don't mean shit, but it's just to illustrate a point. 1 body part per week = 100%. 2 body parts per week = 80% x 2. I'd rather have 160% than 100%.

Depending on the volume & intensity, you should be able to train 3-4 days per week. If you want to spend less time in the gym, then reduce the rest period between sets.

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