Here is a practice with a primary set that will force you to ‘change speeds’ not only throughout the set, but also throughout portions of each swim…
WU-150 Fr/50 Kick x2
6×75 as 25 pull/50 Fr on rest :20
**slow down your tempo on the pull, and mimic the additional length even after dropping the buoy**
3×100 Fr descend 1-3 on rest :30/:20/-
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Primary [1650]
5×100 Fr as 50 build/rest :05/25 FAST/25 EZ on rest :20
4×25 on rest :20 as Freestyle with a soft kick/medium kick/fast kick/EZ
5×75 as 25 build/rest :05/25 FAST/25 EZ on rest :20
4×25 on rest :20 as Freestyle with a soft kick/medium kick/fast kick/EZ
5×50 as 25 FAST/25 EZ on rest :15
4×25 on rest :20 as Freestyle with a soft kick/medium kick/fast kick/EZ
5×25 FAST on rest :15
4×25 on rest :20 as Freestyle with a soft kick/medium kick/fast kick/EZ
Total: 2800 + WD