At age 52 and being an advid runner for many years it’s hard to gain just looking for a way .
You have to eat more
Become an avid lifter instead. Plus, what Max said.
Really, that’s a super-super-super vague “question” you’re asking. There are tons of articles with nutrition plans and workouts to build size, but there are a few factors involved.
Your age is one. Not necessarily a negative, but it’s always tricky putting on size when you’re older because there’s not as much leeway for fat gain. Your current size is another factor. Height, current weight, and current fat level will influence how much/how fast you could/should gain.
And then the training. If you’re still running a bunch, that’s gotta be reduced (not necessarily eliminated) if gaining size is the priority. A well-designed weight training plan is essential. A lot of guys in the Over-35 lifter’s forum seem to like 5/3/1 but any good plan can do the job.
Eat tons of protein and work out all major muscle areas as hard as you safely can, allowing a day in between workouts. Lean proteins such as lean meats, chicken, turkey, etc. Dedication and some rest in between workouts will work best always
Lots of good stuff here…
If have some coin try Plazma and/or Mag-10 intra workout, even 1 scoop makes a big difference
the first step will be to stop all of this running nonsense.