Evidence-Based Study Guide — Foundations & Benefits
How often to train each muscle group
Training frequency is inversely related to both training volume and intensity. Higher-intensity sessions produce more muscle microtrauma → require more recovery time → must be performed less frequently. Lower-intensity sessions need less recovery and can be done more often.
Should NOT train the same muscle groups more often than every 3rd day.
Example split:
Mon/Thu → Push (chest, shoulders, triceps)
Tue/Fri → Pull (back, biceps, trunk)
Wed/Sat → Legs (squats, lunges)
Research (Westcott, 2016): After 10 weeks, training 2 or 3 days/week both increased lean muscle mass by 3.1 lbs (1.4 kg) — equally effective.
1 day/week → significantly less lean weight gain. Minimum of 2 days recommended.
If asked about frequency for beginners → answer: 2–3 days/week. For advanced high-volume trainers → no same muscle group more than every 72 hours (every 3rd day). 1 day/week is marginally productive but NOT recommended as a standalone program.
Primary vs. accessory — sequencing strategies
Involve multiple muscles across 2+ joints (multijoint). Examples: squat, deadlift, bench press, overhead press. These are performed first in a session when energy is highest.
Target smaller muscle groups, single joint. Examples: bicep curl, leg extension, lateral raise. Performed after primary exercises. Reflect specific needs and availability of the client.
Two exercises done in sequence with little or no rest between them. Increases training density and time efficiency.
E.g., chest press followed by seated row. Allows one muscle group to recover while the other works.
Upper and lower extremity exercises alternated within or between training sessions.
Each exercise addresses a different muscle group; shorter rest intervals increase cardio and metabolic responses — popular for weight management goals.
Primary exercises = multijoint, done FIRST. Accessory = single-joint, done AFTER. Guidelines (ACSM 2018) recommend targeting each major muscle group 2–3 days/week minimum.
Quantifying total work performed
Training volume provides a reasonably good indication of total energy expended in a session. There is a direct correlation between volume, weight lifted, and total calories burned. Volume should be changed periodically for physiological and psychological purposes (periodization).
| Training Goal | Sets | Reps | Rest Interval | Intensity (%1-RM) |
|---|---|---|---|---|
| General Muscular Fitness | 1–4 | 8–15 | 2–3 min | 20–70% |
| Muscular Endurance | 2–3 | ≥12 | ≤30 sec | ≤67% |
| Muscular Hypertrophy | 3–6 | 6–12 | 30–90 sec | 67–85% |
| Muscular Strength | 2–6 | ≤6 | 2–5 min | ≥85% |
| Power – Single-effort | 3–5 | 1–2 | 2–5 min | 80–90% |
| Power – Multiple-effort | 3–5 | 3–5 | 2–5 min | 75–85% |
Note: 1-RM = One-repetition maximum. For core exercises involving large muscle groups, loads of ~80% 1-RM are used. In nonexplosive movements, loads ≥8-RM.
You MUST memorize Table 9-12. The most tested row is Hypertrophy: 3–6 sets, 6–12 reps, 67–85% 1-RM, 30–90 sec rest. Volume = Weight × Sets × Reps — know the formula.
% of maximal resistance — the key stimulus variable
1. Percentage of 1-RM (maximal resistance): The load used as a percentage of the maximum weight a person can lift once.
2. Effort level / Muscle fatigue: The degree of muscle fatigue produced during a set — how hard the muscle is working relative to its capacity.
Both volume and intensity are key components of progressive overload. Programs should progress from lower-volume/higher-intensity to moderate-volume/moderate-intensity, concluding with higher-volume/lower-intensity workouts.
For new-to-training clients, begin with low intensity to allow physical and psychological adaptation. Design programs to begin with limited or no significant DOMS — reduces dropout risk.
As a client begins a muscular-training program, keep training volume relatively low initially to allow adaptation. Total training volume can be gradually increased as the client develops adherence, becoming stronger as a result.
Intensity and volume are inversely related within a periodization cycle. High intensity = lower volume; lower intensity = higher volume. New clients should START with lower intensity to avoid excessive DOMS and promote long-term adherence.
Movement speed — concentric & eccentric phases
The commonly recommended movement speed of 6 seconds per repetition is consistent with the repetition speed long recommended for weightstack/selectorized machine training. Concentric → 1–3 seconds; eccentric → 2–4 seconds.
Olympic lifters: Fast movement speeds (high muscle force to initiate; momentum takes over)
Bodybuilders: Moderate speeds (balanced muscle force throughout ROM)
Powerlifters: Slow, controlled speeds (maximize force production, full ROM)
Controlled (4–8 sec): Equally effective for strength development (Westcott, 2016)
Controlled movement speeds require relatively even application of muscle force throughout the entire movement range. Fast movement speeds require high force to initiate the lift, with momentum becoming responsible for the remainder — reducing muscle stimulus in the latter portion of the ROM.
Standard tempo = 6 seconds per rep. Concentric = 1–3 sec. Eccentric = 2–4 sec. Eccentric phase = DOMS trigger — caution with new clients. No single tempo proven optimal; six-second reps are an excellent introductory speed for new exercisers.
Recovery between sets — energy system replenishment
Recovery periods between successive exercises or between successive sets of the same exercise. Length depends on: training goal, conditioning status, load, and amount of work performed. The heavier the load → the longer the rest needed to replenish the muscle's energy pathways.
For most practical purposes and general muscular conditioning, one-minute rest intervals between successive exercise sets are sufficient.
| Population / Goal | Rest Interval | Rationale |
|---|---|---|
| Muscular Endurance | ≤30 seconds | Short rest keeps metabolic stress high, trains fatigue resistance |
| Hypertrophy | 30–90 seconds | Moderate rest maintains metabolic stress + blood congestion in muscle |
| Muscular Strength | 2–5 minutes | Allows near-complete PC replenishment for next heavy set |
| Power | 2–5 minutes | Full energy recovery essential for max power expression |
| General Fitness / Beginners | 2–3 minutes | Enough recovery to maintain technique, avoid excessive fatigue |
| Bodybuilders | 30–90 sec | Short rest → blood congestion ("pump") in prime movers |
| Powerlifters / Olympic Lifters | Several minutes | Complete recovery needed for maximum force production throughout session |
When performing a muscular-training circuit where each exercise addresses a different muscle group, shorter rest intervals increase cardiovascular and metabolic responses — increasingly popular for individuals seeking to lose or manage weight.
PC replenishment: 50% at 30 sec / 75% at 1 min / 95% at 2 min. For strength/power you need 2–5 min rest. For hypertrophy 30–90 sec. For endurance ≤30 sec. New clients: rest long enough to maintain comfort levels but not so long that heart rate returns to fully resting.
Warm-up → Conditioning → Cool-down
Regardless of the client's goal, each exercise session should progress from a warm-up → conditioning portion → cool-down. This structure is non-negotiable for safe, effective training.
A period of lighter exercise preceding the conditioning portion. Should last 5–10 minutes for most healthy adults. Begin with light activity that gradually increases in intensity and takes into account all planes of motion and the exercises planned for the session.
Dynamic and static flexibility exercises can be included. If the goal is to inhibit an overactive muscle or address postural issues → static stretching may be employed (after a brief bout of light activity).
Must be appropriate for the client's current fitness level and consistent with training goals. High-intensity activities should be planned early in the conditioning portion when the client is least likely to be affected by fatigue.
A variety of focus areas can comprise training activities: endurance, strength, power, speed, agility, and/or quickness. Clients have unique goals — program design must reflect this individuality.
Focus on stress reduction, returning the heart rate to resting levels, and initiating relaxation and the recovery process. Should be approximately the same duration and intensity as the warm-up — approximately 5–10 minutes of light activity.
Prolonged static stretching is typically performed at the END of a workout because it may result in neural inhibition and decreased strength — which would be counterproductive if used earlier in a session where strength and power are the intended outcomes.
Warm-up = 5–10 min, light-to-moderate intensity. Static stretching in cool-down ✓; prolonged static stretching in warm-up ✗ (decreases strength/power). Cool-down = same duration/intensity as warm-up. High-intensity conditioning activities should come EARLY in the conditioning portion.
All 6 variables at a glance
| Variable | Key Rule | Exam Number |
|---|---|---|
| Frequency | Beginners: 2–3x/week | Advanced: no same muscle >every 3rd day | 72 hrs, +3.1 lbs muscle in 10 wks |
| Selection | Primary (multijoint) first; Accessory (single-joint) after | Push before pull, large before small |
| Volume | Weight × Sets × Reps; periodize over time | Hypertrophy: 6–12 reps, 3–6 sets |
| Intensity | % of 1-RM; inversely related to volume | Strength ≥85% | Hypertrophy 67–85% |
| Tempo | 6 sec/rep standard; concentric 1–3 sec, eccentric 2–4 sec | Eccentric = DOMS trigger |
| Rest | Longer rest for heavier loads; PC: 50/75/95% at 30s/1min/2min | Endurance ≤30s | Strength 2–5 min |