Negative-split sets

Setup

1. Swimmers have warmed up with easy swimming and some build lengths.
2. Two or three per lane, circle swimming, 5 or 10 seconds apart so each swimmer can see the clock at the 50 m mark.
3. Explain the idea: a negative split means the second half of a swim is quicker than the first.

How it runs

1. Main set: 4 × 100 m freestyle. Rest 30 to 45 seconds between repeats.
2. First 50 m: controlled. Long strokes, relaxed breathing, a pace the swimmer could hold for longer.
3. At the 50 m turn (back at the start wall), swimmers glance at the clock or the coach calls the split.
4. Second 50 m: build. Lift the stroke rate and the kick so the second half comes in faster.
5. After each repeat swimmers compare the two halves. The target is a small, steady difference, not a crawl followed by a sprint.
6. Older or fitter groups can move on to 3 × 200 m, splitting at the 100 m mark.

Coaching points

• The first half should feel almost too easy; that is what makes the finish possible.
• Change one thing at the turn: more kick, a faster arm rate or one fewer breath per length.
• Hold the stroke length as the speed goes up.
• Use the clock honestly; the halves only teach pacing if they are read every time.

Common mistakes

• Going out too hard on the first repeat and fading on the rest.
• Swimming the first half so slowly that the set becomes easy.
• Shortening the stroke into a scramble on the second half.
• Forgetting to look at the clock at the 50 m mark.