Welcome to the board jessica!
I am not a fan of this one set of 12 till failure stuff, you should almost never train till failure, its a good way to get yourself hurt, and its a gateway to overtraining IMO.
I would much rather see you doing 3 sets of lower reps, with heavy wieghts, compared to what you would use for sets of 12. that being said I'm not a fan of push/pull splits, but to each his/her own.
I would also look at splitting your cardio and your lifting up, if you can do it schedule wise.
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