SP build to a 3RM

DU’s
50-40-30-20-10
Butterfly Sit Ups
20-20-20-20-20
Burpees
10-10-10-10-10
Pull Ups
5-5-5-5-5

This is a 5 round wod.
1st Round
50 DU
20 BFS
10 Burpees
5 Pull Ups
DU’s go down. Everything else stays the same
Sub for DU is singles at 3:1