I think lifters make Zone 2 way more complicated than it needs to be. People get hung up on a heart-rate number, then spend the whole run staring at their watch and speeding up or slowing down every thirty seconds.
For a lifter who is just trying to build some aerobic fitness, start simpler. Run easy enough that you can talk in full sentences. Finish the run feeling like you had more in you. If a hill pushes you out of that effort, slow down. Walk it if you need to.
That is fine. Nobody is grading the run.
What I mean by Zone 2
Different watches use different heart-rate zones, so I would not treat one percentage of max heart rate like a law. The idea is to spend time at a low enough intensity that you can accumulate aerobic work without turning the session into another hard lower-body day.
If you have a recent race or time trial, you can get more specific with your running pace zones. If you do not, the talk test gets you surprisingly far.
Easy should actually feel easy. That sounds obvious until someone who squats four days a week decides every run also needs to feel productive.
Why I start lifters with easy running
Running and lifting can live in the same program. We have research showing that adding strength work to endurance training can improve running performance without wiping out lean mass.1 We also have endurance research showing that a lot of useful training can happen below the ventilatory or lactate threshold.23
The practical part matters more to me. If your main goal is still strength, you only have so many hard lower-body sessions you can recover from well. A heavy squat day counts. A hard deadlift day counts. Intervals count too.
So I would rather have a lifter get good at easy running first than immediately add another session that beats up the legs.
Two runs is enough to start
You do not need a five-day running plan because you bought running shoes last week. Start with two runs.
Something like 20 to 30 minutes on one day and 25 to 35 minutes on another is plenty at first. Keep both easy. Do that for a few weeks and pay attention to what happens in the gym.
Are your squats still moving? Do your shins and feet feel normal? Are you dragging through lower-body sessions? Those answers matter more than whether the run looked impressive on Strava.
Your lungs can feel ready before the rest of you is ready. New runners run into this all the time. Cardiovascularly they feel decent, so they add mileage fast. Their calves, feet, knees, or shins are the part that finally says no.
Putting easy runs around leg days
There is no perfect weekly layout for everybody, but I use a pretty simple rule: protect the lifting sessions that matter most.
If you have a heavy squat or deadlift day tomorrow, today's run should stay easy. If you lift and run on the same day and strength is the priority, lift first. When the schedule allows it, put a few hours between the two sessions, eat something, get fluids back in, then go run.
After a hard leg day, an easy run can be completely reasonable if you are moving normally. I would not force it if you are so sore that your stride changes. At that point you are not getting bonus points for toughness. You are just practicing running badly.
Do not race your easy pace
This is probably the easiest mistake to make. You run the same route every week, notice you were ten seconds per mile slower, and suddenly the easy day turns into a test.
Leave it alone.
Heat changes pace. Hills change pace. A hard lower session yesterday changes pace. Bad sleep changes pace. If the goal is easy aerobic work, keep the effort where it belongs and let the number move around a little.
When faster running finally makes sense
Once two or three easy runs feel normal and your lifting is still moving in the right direction, then I would look at adding some faster work if your goals need it. Maybe that is a threshold session. Maybe intervals. Maybe you still do not need either one yet.
Hard running should earn a place in the week. Treat it like another meaningful lower-body stressor and put it somewhere that makes sense around squats, deadlifts, and the rest of your training.
If you are trying to figure out the full week, start with Running for Lifters or use one of the hybrid athlete training schedules as a template.
Research cited
- Trowell D, et al. Effect of concurrent strength and endurance training on run performance and biomechanics: a randomized controlled trial. 2022. PubMed.
- Esteve-Lanao J, et al. Impact of training intensity distribution on performance in endurance athletes. 2007. PubMed.
- Muñoz I, et al. Does polarized training improve performance in recreational runners? 2014. PubMed.