Is 5’8 150lbs too big to run fast?

if it's your natural build, it's not too big. if you are going out of your way to keep that mass on, it's most likely not helping your running.

that's my gut feeling anyway.

you're probably not running under 4 but i ran 4:32 at 5'7 150

What time range do you think it’ll really start to set a rock solid barrier at? Times where you won’t get faster unless you get rid of that excess weight

I was 5'9, and ranged between 150-155 when i ran in college. I ran 14:11 for 5k. As coach above said, if it's your natural build then it shouldn't be an issue

look up peter snell. and who was that youtuber from oregon with 800 prowess?

4:05

What about Andy Wheating? He ran for Oregon and professionally and was a sub 1:45 & 3:30ish guy. IIRC he was close to 200 pounds. Granted, he was a tall guy - probably somewhere around 6'5".

Only on Letsrun is 5'8 150 "too big". Lol.

I'm 6'3 and was 225 at one point. At 225 I had trouble with running fast. Did a Parkrun in a miserable 20:36. Back and calves were killing me. 195 is my best race weight these days, but even at 205 I can get through a 5k in mid 18's.

Was much lighter in my college running days. 169. Still much bigger than you.

No.

That's the exact height and weight of C.J. Albertson, a sub-2:10 marathoner from the U.S.

Even less of a concern if you're a middle-distance runner. Nick Symmonds was similar, a tad taller and heavier.

No. He has dropped to sub 140.

No, its not too big

For 800m and down, this proportion is fairly typical. For anything above, as long as you’re training well, you should be fine

800m?

That's about the weight of Zach Miller(professional mountain runner)and he's a bit shorter than 5'8. So even though it's not the ideal BMI for track/XC, you can be very successful in mountain running at that BMI.

6'3.5" 176# 1:48.76, 3:48.??.. You're not built for this.

You said in your first post you had a lean, muscular build. So I don't think "get rid of that excess weight" is really an option.

Yeah I got my pro triathlon card off of basically this build and I'm trying to add on some more weight. Lots of pro triathletes around 5-8 & 160-175 who run well. I've added ~10-15 pounds from my only running days & my times haven't moved at all. I ran a half marathon PB in the middle of 70.3 training.

Would rather sit at a normal weight, have good energy, not get injured, etc. than drop weight & feel like death all the time. Would rather be up a pound or two & just focus on the training.

Henry Rono was around five foot seven and 140 pounds

and he raced near world class while fat at 150

I was 5'9" and 150–155lbs running well over 800 and mile in my time. Could run a semi-respectable 400 and 5k as well. Anything over 5k and I really, really struggled.

Solinsky broke 27 in the 10k and looked like a football player doing it.