hello there im going to start training twice a day and was wondering if you have to train the same muscle group on the same day but different exercises. or do you train totally different muscle groups on the same day.
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You generally want to separate sessions of exercising any given muscle group by ~48 hrs. If you intentionally are trying to pre-exhaust a muscle group, you might do a 2/day on something like back & biceps where biceps are technically getting worked out twice - once on their own, and once as a subset of back. (Not sure why you'd do that tho - biceps & tris tend to get worked out exactly because they are a necessary subset of back or chest, and further, because of dependence on the wrist & elbow joints, this would actually probably increase the chance for repetitive motion injury (i.e. wrist / elbow tendonitis).
But generally better to split up your muscles groups by 2 days.
A different approach might be AM training, PM cardio or maybe Crossfit or something more functional/agility-oriented.
Another way might be similar to 5x5 if your'e doing instead of "per-muscle group", more like Squat day, Press day, etc. and make your second workout some sort of supporting working - accessory, etc. that doesn't interfere w/ recovery of the primary muscle group from the first workout.
Solid post sassy ! Ps thank you for the video u posted with the back and shoulder foam roller. It works amazing.
To the OP. what are u trying to achieve with this approach? I agree with sassy. If u wanna pound a muscle more then once a week give it 48 hrs.
An additional thought I had to the OP is what is the reason you are even considering it? Sometimes its a timing necessity or something that constrains you to those times, but just looking at the desire for many, particularly newer lifters, the desire for intensity and a lot of it as a measure of "dedication" or drive to "get big" or achieve whatever goal "faster". When you're younger, you can actually get away w/ some of that. However if you don't adjust that tendency as you get older, the wear & tear, egged on by the simple habit of doing that stuff and idea that "recovery is for sissies", you will find yourself w/ a lot of joint issues that you will pay for when you hit 40. I have one friend right now who lives the "Go big or go home" lifestyle. I actually thought he was older than me. Turns out he's 10 yrs younger, but just recently blew out his back from heavy lifting, and continues to lift. He also likes to pop Anadrols like TicTacs, has raving high blood pressure and perpetually wears knee sleeves, elbow sleeves and a weight belt so he doesn't fall apart. He's 35. Its a long way to 70 when you're already having trouble getting out of bed in the morning.
Anyway, just a thought. More is never better, but the quality and consistency of what you do and what you don't do (i.e. recovery) is the key to being able to do this stuff for much longer than just the immediate future.