Table 2. Swimming session classifications and their most prevalent descriptive key terms. Common Sessions Higher Order Theme Aerobic VO2 / Heart rate Threshold Tolerance Pure speed Session Classifications A1 Aerobic maintenance Aerobic capacity Spike VO2 Heart Rate Anaerobic capacity Anaerobic production Aerobic power Anaerobic power Production Anaerobic capacity Production Anaerobic power Anaerobic production Speed endurance Race pace Speed endurance Speed/race pace Descriptive Key Codes Easy Recovery Blood lactate <4mmol Blood lactate 2-4mmol Skills Technique Short interval 40-50 Beats below Over distance Descend to threshold Aerobic High risk high reward 10-15 beats below VO2 Heart rate Produce and remove lactate equally Intensity, which represents line between aerobic and anaerobic 20-30 beats below Blood lactate 3-6mmol Balance between production and removal Threshold Produce Lactate Continue to swim well with high lactate 4k High intensity Medium rest Tolerate lactate Acidity in muscle Tolerance Speed Pure Short Burst Above race pace 15-25m efforts Moderate rest Resistance Assistance Unique Sessions Higher Order Theme Skills Fitness Kick sets Rainbow sets A2 Descriptive Key Codes Starts Turns Skills Aspect of stroke Fitness General Combo session Pool/Gym Isolation work Kicking Paddles Kick Kicking ability Stroke specific Combination Range of intensity zones Specific for open water Change pace Rainbow set Aerobic Development