Swimming Speed Sets: The Best Sets to Swim Faster

Quick summary: Swimming speed is trained in 4 types: pure sprint (maximum intensity), lactate tolerance (115% CSS), VO₂ max (108% CSS) and race pace. Each type requires different rest intervals and distances. 1-2 speed sessions per week is sufficient.

Swimming speed sets are essential for lowering your times in events from 50m to 400m. But speed isn't improved by just swimming fast — it requires a structured approach with the right intensity zones, proper rest and a prior aerobic endurance base.

Types of speed work

1. Pure speed (sprints)

Short sets at maximum intensity with full recovery. Example: 8×25m sprint with 45 seconds rest. These develop neuromuscular power, maximum stroke rate and high-speed coordination. Long rest is essential — if you don't recover, it's not sprint work, it's lactate tolerance.

2. Lactate tolerance (LAC zone)

50-100m sets at 115% of your CSS with moderate rest. Example: 6×100m at LAC pace with 60 seconds rest. These train the ability to maintain high speed with lactate accumulation. Ideal for preparing the 100 freestyle.

3. VO₂ max

100-200m sets at 108% CSS with controlled rest. Example: 8×100m at VO₂ pace with 30 seconds rest. These develop maximum oxygen consumption capacity, crucial for the final meters of any race.

4. Pace work

Sets at your target race pace with rest that simulates race conditions. Ideal for preparing specific events like the 100 freestyle or the 400 freestyle. Develops "pace memory" — knowing exactly what your target speed feels like.

Important: Never do speed work without a complete warm-up of at least 800m. Cold muscles can't generate maximum power and injury risk is high.

The 5 best speed sets

Set 1: "Explosive descend"

4×(4×50m) — each block of 4 descending in pace. Rest: 15" between 50s, 60" between blocks. The last 50m of each block should be at maximum speed.

Set 2: "Broken 200"

4×(4×50m) at target 200m pace with 10" between 50s. Add up the splits and compare with your best 200m. Goal: total less than your PB + 40".

Set 3: "Classic VO₂"

8×100m at VO₂ pace (108% CSS) with 30" rest. The standard for developing aerobic power. Try to keep all 100s within ±2 seconds.

Set 4: "Sprint + hold"

8×75m (25m sprint + 50m TH pace) with 30" rest. Works the transition from maximum speed to sustained pace — exactly what you need in racing.

Set 5: "Controlled lactate"

3×(3×100m) at LAC pace with 30" between 100s and 2 minutes between blocks. Develops pain tolerance and the ability to maintain speed under extreme fatigue.

When to do speed work?

After building an aerobic endurance base (minimum 3-4 weeks). A balanced plan includes 1-2 speed sessions per week, ideally when you're rested (not the day after a long endurance session).

With Swimer, speed sets are automatically integrated into your block plan with exact paces based on your CSS. Calculate your CSS and get your personalized speed paces.

Swimer handles all of this: connect your federated identity (RFEN, NCAA, European Aquatics) and Strava, we compute your CSS and 6 exact zones, you get adaptive cycles with automatic tapering, follow the global elite live and share PBs on the first vertical social network for swimmers. Coach Portal included. Native multi-pool. Free during launch, RFEN-backed. Join the Swimming Metaverse.