Stop guessing at intervals. This guide teaches you to read any swim workout — zones, abbreviations, rest times, and pace targets. Build and export to Garmin.
Every swimmer has stared at a workout sheet and wondered what "4x200 @ 2:45" actually means. This guide fixes that. You'll learn to decode distances, intervals, training zones, and abbreviations so you arrive at the pool knowing exactly what to do — no awkward lane neighbor glances required. How To Read A Swim Workout: Notation Basics Swim workouts use shorthand that evolved from deck coaching — a coach shouting instructions to a pool full of swimmers can't say "please swim four lengths of the pool at a pace that feels sustainable for a two-minute effort, and rest for thirty seconds between each repetition." Instead, they say "4x100 on 2:00." This notation system has survived because it works.
The fundamental structure of any swim workout is: set × distance @ target_time. A set is a group of repetitions. A distance is how far you swim before resting or turning around. A target time is how fast you should swim — or how long you have to finish. Consider "8x50 freestyle @ 45 seconds." You swim 50 meters eight times. Each 50 should take roughly 40-42 seconds, leaving 3-5 seconds of rest before the next one starts.
The interval (your total window) is 45 seconds from send-off to send-off. If you take 43 seconds to swim your 50, you rest 2 seconds. If you take 47 seconds, you're late — the next repeat starts at 45 seconds regardless of whether you've finished. Some workouts use pace targets instead of interval times. "6x100 @ 1:30 pace" means swim each 100 in 1:30 or faster.
You don't wait for a clock — you swim your target pace, then rest as needed until the next repeat begins. The difference matters: interval training teaches you to manage time; pace training teaches you to manage effort. Both are valuable. How To Read A Swim Workout: Training Zones Every swim workout targets a training zone — a physiological system you're trying to develop.
AquaPlan uses 9 color-coded zones. Understanding them is the difference between swimming random laps and training with intent. GA1 (General Aerobic 1) is your easy zone. You can hold a conversation. Heart rate sits at 60-70% of maximum. These sessions build your aerobic base — the foundation everything else runs on. Elite swimmers spend 60-70% of their yardage in GA1.
Most age-group swimmers do too little. If you're new to structured training, start here. GA2 (General Aerobic 2) pushes harder. You can speak in short phrases but not full sentences. Heart rate targets 70-80% of maximum. This zone develops your aerobic threshold — the pace you can hold for extended efforts. A typical GA2 set might be 6x200 @ 3:15, where each 200 takes ~3:00-3:05, leaving 10-15 seconds recovery.
WA (Working Aerobic / Lactate Threshold) is where things get uncomfortable. You can't talk. Heart rate sits at 80-88% maximum. Training here increases your lactate clearance ability — you can push harder before fatigue catches up. Sets typically involve 400-800m of sustained effort at threshold pace, broken into manageable chunks. SA (Sprint/Anaerobic) is maximum effort.
Heart rate 90%+ max. These sets are short — 25s and 50s only — because you can't sustain this output. Sprint work develops power and stroke efficiency at high velocity. Most swimmers do too little of it. Drill, Kick, and IM zones target specific components. Drill work isolates stroke technique — catch, pull, or body rotation. Kick builds leg strength and body position.
IM (Individual Medley) combines all four strokes in one set, developing versatility and stroke economy. What All Those Abbreviations Mean Swim notation uses a consistent vocabulary. Once you know the building blocks, any workout becomes readable. Here's the lexicon: Distance abbreviations: 25 (one length, or 25 meters/yards), 50 (two lengths), 75 (three lengths, common in sprint work), 100 (four lengths, the standard work unit), 200 (eight lengths), 400 (sixteen lengths), 800 (thirty-two lengths), 1500 (sixty lengths).
A "single" means one length; a "double" means two lengths. Stroke abbreviations: FR = freestyle (also FC for front crawl), BK = backstroke, BR = breaststroke, FL = butterfly (also FA), IM = individual medley (all four strokes in order: butterfly, backstroke, breaststroke, freestyle), IM-X = IM with one stroke replaced by freestyle (e.g., IM-FLY replaces butterfly with freestyle, keeping the medley order).
