I actually like double days when they solve a scheduling problem.
You lift four days. You want to run three. You also have a job and a life.
At some point two sessions are probably going to land on the same day.
That does not bother me.
What bothers me is something like hard intervals at 6 a.m., heavy squats at 8 a.m., then acting surprised when the squat session feels terrible.
The clock did not reset your legs.
Whichever session matters more should usually go first
If strength is the priority, I want the lifting session getting the fresher version of you.
If you are six weeks from a race and today's interval workout is one of the most important runs of the week, I am much more willing to put the run first.
That is the rule I keep coming back to.
Protect the thing you care about most.
People sometimes want a universal answer because it is cleaner. Lift first. Always. Or run first. Always.
I do not think training works that way.
Upper body plus an easy run is pretty easy to live with
This is the double I worry about the least.
Bench, rows, shoulders, then an easy 30-minute run later?
Usually fine.
That is a completely different day from heavy deadlifts plus threshold work.
Same number of sessions.
Very different cost.
This is why I care about what the workouts actually are instead of just counting workouts on a calendar.
A few hours between sessions helps
If I can choose between running ten minutes after the last squat set and running later that afternoon, I am taking the later run.
Eat.
Drink something.
Get off your feet for a while.
Then go do the second session.
You do not need to turn this into a six-hour recovery protocol with a spreadsheet. I just want some separation when both sessions ask something meaningful from the same muscles.
If the only option is back-to-back, make one of the sessions cheap.
That might mean the run stays genuinely easy. Or the lifting session is upper body. Or you cut accessory work that was not doing much besides making the day longer.
Hard lower body plus hard running is where I get picky
Picture this day.
Heavy squat work. Bulgarian split squats. Hamstring work.
Then later you have 6 x 800 meters.
Could you finish both?
Probably.
I am more interested in whether that was a good way to spend the week.
If Tuesday turns into a war, Wednesday and Thursday now have to deal with what Tuesday did.
Hybrid programming gets bad fast when every hard session is judged in isolation.
Easy running earns a lot of flexibility
This is another reason I push lifters toward easy running when they are starting.
An easy run is much easier to move around.
It can live after upper body. It can happen later on a lower-body day. It can fill a day that would otherwise be completely off without turning into a second leg workout you need three days to recover from.
As soon as the run becomes threshold work or intervals, I treat it differently.
Hard running is a hard session.
Give it a real place.
What I would do with a normal hybrid week
Say you lift four days and run three.
I would much rather double an easy run with an upper-body day than force seven separate training days just so the calendar looks tidy.
Maybe Monday is lower. Tuesday is upper plus easy run. Wednesday is the hard run. Thursday is upper. Friday is lower. Sunday is the long run.
That gives the harder lower-body work some room.
Could another layout work?
Of course.
The point is knowing which sessions are expensive and keeping those from constantly stepping on each other.
If you want a few full-week examples, use the hybrid athlete training schedules. If most of your runs are still new, start with Zone 2 Running for Lifters.