Because zig-zagging is not a problem!!
- equal RM is valid for 3-4 weeks = 21 -28 days
- muscular resistance toward a RM is established later 21-28 days
- zig-zagging among 10s and 5s is in the 15-17 day
- in the 15-17 day any resistance is still established to 10RM
- conclusions: 10RM still...