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Training Systems

Circuit Program

Evidence-grounded — sourced from Fysiqal's fitness knowledge graph· 2 min read
circuitendurancecardiovascularvo2maxtime-efficientgettman-pollockendurance

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In one line

A series of exercises performed back-to-back with minimal rest at light loads — very time-efficient and yields small cardiovascular gains.

Detail

Circuit programs consist of a series of resistance-training exercises that are performed one after the other with minimal rest (15–30 seconds) between exercises. Approximately 10 to 15 repetitions of each exercise are performed per circuit at a resistance of 40 to 60% of one RM — corrected in a handwritten margin annotation to 50–70% of 1 RM (the printed "40 to 60%" is struck through). If desired, several circuits of the exercises can be performed. This type of program is very time-efficient: for the facility, since each piece of equipment is virtually kept in constant use, and for the individual, because of its short rest periods.

Circuit weight training may also produce slight improvement in cardiovascular fitness. Circuit programs of short-term duration (8 weeks to 20 weeks) increase maximal oxygen consumption (VO2 max.) approximately 4% to 8% in men and women (Gettman & Pollock, 1981). This is substantially less than the 15% increase in VO2 max. produced by cardiovascular conditioning programs (running & cycling) over the same period.

Key facts

  • Rest between exercises: 15–30 seconds.
  • Reps: approximately 10–15 per exercise.
  • Resistance: 40–60% of 1 RM in the printed text, hand-corrected to 50–70% of 1 RM.
  • Several circuits optional.
  • VO2 max. gain ~4%–8% over 8–20 weeks (Gettman & Pollock, 1981) vs. ~15% from running/cycling over the same period.

Connections

  • rest-between-sets — minimal (15–30 s) rest defines the system.
  • lactic-acid-system — short rests force adaptation to a continuous intense work effort.
  • cardiorespiratory-guidelines — circuit yields modest cardiovascular gains vs. dedicated aerobic work.
SourceReference manual
p.112
Cited authorities in source: Gettman & Pollock (1981).
Fysiqal’s program generator automates exactly this.Build my strength plan

Educational content only — not medical advice. Always consult a qualified professional for individualized guidance, especially around injury, pregnancy, or medical conditions.

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Atlas Connections

Cardiorespiratory Conditioning Guidelines (Peterson & Bryant / ACSM)
The five-part ACSM prescription for building and keeping cardiorespiratory fitness — frequency 3–5 days/wk, intensity 60–90% of max HR, duration 20–60 min, large-muscle continuous aerobic mode, and gradual progression.
Lactic Acid (Glycolytic) System
An anaerobic pathway that breaks glycogen/glucose down to lactic acid for a net 2 ATP, dominant in all-out efforts of about 1–3 minutes — at the cost of fatiguing acidity.
Principle of Specificity (SAID)
Training adaptations are specific to how you train — match the muscles, movements, and posture of the target activity to get carryover.
Intensity
The amount of weight (resistance) lifted — also shaped by speed, reps, sets, rest interval, and workout duration.
Repetition
One complete movement of an exercise, from the start position through the full motion and back, made up of a concentric, mid-range, and eccentric phase.
Rest Periods Between SetsClosely related
How long you rest between sets — long rests (3-5 min) favor strength, short rests (under a minute) favor endurance and stress the lactic acid system.