Key Principles
The FITT Principle
FITT is the standard framework for exercise prescription across all healthcare disciplines:
| Component |
Definition |
General Guideline (Healthy Adults) |
| F — Frequency |
How often |
3-5 days per week |
| I — Intensity |
How hard |
Moderate intensity (can talk but not sing) |
| T — Time (Duration) |
How long |
150 min/week moderate OR 75 min/week vigorous |
| T — Type |
What kind |
Rhythmic, continuous activities using large muscle groups (walking, cycling, swimming) |
These guidelines align with the Canadian Society for Exercise Physiology (CSEP) and the American College of Sports Medicine (ACSM) recommendations.
Intensity Monitoring Methods
#### 1. Heart Rate Monitoring
Target heart rate zone = percentage of estimated maximum heart rate (HRmax)
- HRmax formula: 220 - age (Fox formula — simple, widely used, has limitations)
- Moderate intensity: 50-70% of HRmax
- Vigorous intensity: 70-85% of HRmax
| Age |
HRmax (est.) |
Moderate Zone (50-70%) |
Vigorous Zone (70-85%) |
| 20 |
200 |
100-140 bpm |
140-170 bpm |
| 30 |
190 |
95-133 bpm |
133-162 bpm |
| 40 |
180 |
90-126 bpm |
126-153 bpm |
| 50 |
170 |
85-119 bpm |
119-145 bpm |
| 60 |
160 |
80-112 bpm |
112-136 bpm |
| 70 |
150 |
75-105 bpm |
105-128 bpm |
Limitations of HR monitoring:
- Beta-blockers blunt heart rate response — HR targets are unreliable for clients on beta-blockers (use RPE instead)
- Caffeine, dehydration, illness, and emotional stress all affect resting and exercise HR
- The 220-age formula has a standard error of +/-10-12 bpm — it is an estimate, not a precision tool
- Atrial fibrillation and other arrhythmias make pulse rate monitoring unreliable
#### 2. Rating of Perceived Exertion (RPE) — Borg Scale
The RPE scale measures subjective effort intensity. It is more practical than HR monitoring in most MT contexts and is valid for clients on beta-blockers.
Modified Borg Scale (0-10):
| RPE |
Description |
Intensity Level |
| 0 |
Nothing at all |
Rest |
| 1 |
Very light |
Barely noticeable effort |
| 2 |
Light |
Comfortable, could maintain for hours |
| 3 |
Moderate |
Breathing harder, can still talk |
← Target for most clients |
| 4 |
Somewhat hard |
Starting to sweat, conversation becoming difficult |
← Upper moderate |
| 5 |
Hard |
Difficult to hold a conversation |
| 6 |
Harder |
Can only speak a few words |
| 7 |
Very hard |
Very difficult to maintain |
| 8-9 |
Extremely hard |
Near maximal |
| 10 |
Maximal |
Cannot continue |
How to teach RPE to clients:
> "I'd like you to walk at a pace where you're breathing harder than normal but you can still carry on a conversation. If you can sing, you're going too easy. If you can barely talk, you're going too hard. Aim for about a 3-4 out of 10 on the effort scale."
#### 3. Talk Test
The simplest intensity monitor — no equipment needed:
- Too easy: Can sing or recite a passage without effort
- Moderate (target): Can talk in full sentences but conversation requires effort
- Too hard: Can only say a few words between breaths
- Way too hard: Cannot speak at all
Progression Principles
- Start low, go slow. For deconditioned clients, begin with 5-10 minutes of walking at a comfortable pace, 3 days per week.
- Increase duration before intensity. Add 5 minutes per week until reaching 30 minutes, then consider increasing pace.
- 10% rule: Do not increase total weekly duration or intensity by more than 10% per week.
- Rest days are training days. Ensure at least 1-2 rest days per week, especially for deconditioned or older clients.
- Symptom-limited progression. If the client experiences increased pain, excessive fatigue, dizziness, or chest discomfort, reduce intensity and reassess.
Clinical Application
Prescribing Walking Programs (The Most Common MT Recommendation)
Walking is the most accessible, lowest-risk aerobic exercise and the most common cardiovascular recommendation RMTs provide.
Beginner walking program (deconditioned client):
| Week |
Frequency |
Duration |
Intensity |
| 1-2 |
3 days/week |
10 min |
Comfortable pace (RPE 2) |
| 3-4 |
3-4 days/week |
15 min |
Slightly brisk (RPE 2-3) |
| 5-6 |
4 days/week |
20 min |
Brisk (RPE 3) |
| 7-8 |
4-5 days/week |
25 min |
Brisk (RPE 3-4) |
| 9-10 |
5 days/week |
30 min |
Brisk (RPE 3-4) |
Verbal script for prescribing a walking program:
> "One of the most helpful things you can do for your recovery is regular walking. I'd suggest starting with 10 minutes, 3 times a week, at a comfortable pace — think of a casual stroll. Each week, try to add about 5 minutes. The goal over a couple of months is to get to 30 minutes, 5 times a week, at a pace where you're breathing a bit harder but can still have a conversation. If you have more pain after walking, shorten the time or slow down — then try again the next day."
Modifications for Common Conditions
| Condition |
Modification |
Rationale |
| Hypertension |
Avoid isometric exercises; moderate aerobic preferred; stop if BP >200/110 pre-exercise |
Aerobic exercise lowers resting BP 5-7 mmHg; isometrics cause acute BP spikes |
| Diabetes (Type 2) |
Exercise after meals; carry glucose source; check feet daily; avoid exercise if blood glucose >250 mg/dL with ketones |
Exercise improves insulin sensitivity; hypoglycemia risk with insulin/sulfonylureas |
| Osteoarthritis |
Low-impact (walking, cycling, aquatics); avoid high-impact (running, jumping); warm up thoroughly |
Weight-bearing exercise strengthens periarticular muscles; high impact worsens joint loading |
| Fibromyalgia |
Start at very low intensity (RPE 1-2); progress very slowly; aquatic exercise may be better tolerated |
Aerobic exercise has strong evidence for pain and function in fibromyalgia; overexertion triggers flares |
| Pregnancy |
Avoid supine exercise after 1st trimester; moderate intensity; stop if vaginal bleeding, dizziness, or contractions |
CSEP recommends 150 min/week moderate activity in uncomplicated pregnancy |
| Chronic low back pain |
Walking is first-line; maintain neutral spine; avoid prolonged sitting |
Strong evidence for walking in CLBP management; fear-avoidance must be addressed |
| Depression/anxiety |
Frame exercise as a "mood tool" rather than a physical health obligation; any activity counts |
30 min moderate exercise 3x/week has effect sizes comparable to some antidepressants |
| Post-cardiac event |
Refer to cardiac rehabilitation first; do not prescribe independently |
Cardiac rehab provides supervised, monitored, progressive exercise with medical oversight |
Absolute Contraindications to Aerobic Exercise
If any of these are present,
do not recommend exercise — refer to the client's physician:
- Unstable angina
- Uncontrolled heart failure
- Uncontrolled arrhythmia
- Severe aortic stenosis
- Acute myocarditis, pericarditis, or endocarditis
- Acute pulmonary embolism or DVT
- Acute systemic infection with fever
- Uncontrolled hypertension (>200/110 at rest)
Relative Contraindications (Modify and Monitor)
- Controlled hypertension on medication (use RPE, not HR if on beta-blockers)
- Controlled diabetes (timing, glucose monitoring, foot care)
- Moderate valvular heart disease
- Electrolyte abnormalities
- Chronic infectious disease (HIV — exercise beneficial but intensity should match capacity)
When to Refer to an Exercise Specialist
Refer to a kinesiologist, exercise physiologist, or physiotherapist when:
- The client has a cardiac condition requiring monitored exercise
- The client has complex comorbidities that require specialized programming
- The client needs sport-specific training beyond general conditioning
- The client has a pulmonary condition (COPD, severe asthma) requiring respiratory monitoring during exercise
- The client is post-surgical and needs progressive loading guidance beyond basic walking
- The client is not progressing with your recommendations and needs formal exercise testing