Can't figure out why shoulders are always tired when I run...what do I do with my hands?

Can’t figure out why my shoulders are always tired when I run…what do I do with my hands?

Wallace and Gromit
Teams of 2
You go I go
5 rounds each:
400m Run
10 Unbroken Hang Power Clean + Jerk @ 135/95

Post Team Names and Times to Comments.

Box Brief
Thanksgiving Schedule:
Thanksgiving Day (11/24) – 6am Class
Friday (11/25) – Open Gym 9am to 12pm
Saturday (11/26) – 7am and 9am Class
Sunday (11/27) – Open Gym 930am to 1230pm