What thin calfs, long tendons, and narrow pelvis' have to do with running

This is why I'm saying CONSIDER ULTRA MOUNTAIN people. If you are in your physical prime (20s) and can't run a 55 second 400m, maybe your best potential is in 4+ hour races.

https://www.outsideonline.com/sites/default/files/styles/full-page/public/migrated-images_parent/migrated-images_67/kilian-jornet-bozeman-montana_h.jpg?itok=hVXvwSud

Epstein should know that ALL of the runners on the line likely have this body structure these days.

Gone are the days of Deek.

Also the "striations" in those pics are not muscular tissue. It's more like fluid between the muscle sheath and muscle.

Do a forearm workout (of your choice) and then flex your arm. You will see this phenomenon .

Light calf means less mass to swing--takes more energy to move a pound at the end of the leg than nearer the center of mass.

Tendons help with energy return.

"...of your choice."

Nice one there

Runners often give up on trying to reach one's sprint potential too soon. Once runners reach the point where runners are no long asked to race a 400m leg on a medley often runners give up on speed training. [Speed training is not 15 x 400m in 75 seconds a lap.] Guys who are too big to be elite Marathoners; guys who cannot race sub-55 400m should look at throwing javelin. If one has a natural 6'0" 185 lbs. build and one cannot break 55 for 400m, don't starve one's self to 165 lbs. Instead, bulk up to 210 lbs. and throw javelin. Do not start down the road to ultras. One can't get an athletic grant in college as a future ultra person.

ironside wrote:

Guys who are too big to be elite Marathoners; guys who cannot race sub-55 400m should look at throwing javelin. If one has a natural 6'0" 185 lbs. build and one cannot break 55 for 400m, don't starve one's self to 165 lbs. Instead, bulk up to 210 lbs. and throw javelin. Do not start down the road to ultras. One can't get an athletic grant in college as a future ultra person.

Good post, but if you can throw javelin well you can probably sprint pretty well. A natural 6' 185 who can't sprint, yes, might be too heavy for ULTRAS so should take up ROWING clearly (seriously).

6' 185# might be big enough for a competitive non-freestyle swimmer also, or smaller college freestyler

Mustache ride wrote:

6' 185# might be big enough for a competitive non-freestyle swimmer also, or smaller college freestyler

Yes, ultimately, consider all sports or do what you like, but the former is better.

So what are the measurements for "thin" and where on your legs do you measure?

Ankle? Around the bone, just above? Calf? Widest part near the knee?