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If your back is hurting from the ~1lb extra going from 13" to 15", I would recommend some body weight exercises. Your back will thank you, and you'll find getting older to be much less painful.

Regarding a small iPad, isn't that the iPad mini? 8" vs 7" is pretty close to what you're asking for.

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I highly recommend doing pull-ups for your posture and health. It was shocking to me how much the state of my spine improved after doing pull-ups as a daily exercise.

set and rep protocol?

I just have a bar in my apartment in a doorway. Sometimes when I walk by I do 3 - 8 pull ups, then go on my way. Do that a few times a day and you’re doing pretty good. Sometimes I’ll do a few L pull ups as well.

If I’m doing pull ups in the gym I’ll do 3 sets of 7. That’s the most I can do at the moment.

The average HN based-boy apple user has almost negative arm strength. You're asking them to start with pull ups? They need to be able to do a real push-up first!

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