70.3 Training question

The back to back Saturday - Sunday thing is a function of time, as most people have those days to go long and recover.  While some think the long Sunday run is good to "simulate" running on tired legs, myself (and many others) call BS.

Monday would actually be a better day to do your long run, and will give you a higher quality run workout. 

ETA - That said, I do the typical long ride Sat -long run Sun simply because that fits my schedule

For most average athletes, the best plan is going to be one that works best with your schedule.  If doing your long run and swim on Monday keeps your life in order best, then that's what's going to work best for you.

Chris brings up a very good point that if you do your LR on Monday, you will be a little fresher and could lead you to have a better quality run.

However, if it takes you another day to recover from that run, then that's one more easy or recovery day you need to take in addition to your Sunday rest day.  So maybe instead of a full rest day on Sunday...possibly squeeze in a short workout like a 1 hour ride? 

Just know that there really is no right or wrong answer.  Just train as much as you can and have fun.

For me, family balance is more important than any amount of 'extra training' I could squeeze in.  Without my wife being supportive, there's no way I could train for IM. 

I try to look for compromises and she does the same for me.  For example, if we have an event on either Friday / Saturday night I'll always go along and then either make Saturday / Sunday a shorter day or start later.  I also try to get up and start my workouts very early (5:00 - 5:30am) so I don't spend the entire day on Saturday / Sunday's away from home training.    

That said, I do my long bikes on Saturday (4-6 hours) and my long run on Sundays (1-3 hours).  

I rarely took a day off. It was so hard to fit everything in if I did. I did do a lot of 4:30 a.m. workouts though. That helped with the harmony too. I also do training when my son is at his activities, karate/drum lessons, instead of just sitting there.