Robert Davis
Most people I work with are afraid of stopping too soon. They push through discomfort because they’ve been told exercise is supposed to be hard, and they don’t want to seem like they’re making excuses. I get it. But after years of working with adults in their 60s, 70s, and 80s, I’ll be honest: the mistake I see far more often is the opposite. People ignore warning signs that are genuinely serious, and sometimes that costs them dearly.
There’s a moment I keep coming back to. A client of mine, a 71-year-old retired teacher named Gerald, was halfway through a light resistance circuit when he mentioned his left arm felt “a little strange.” He almost didn’t say anything. He’d been told that mild discomfort was normal. What he was feeling wasn’t normal. We stopped immediately, I had him sit down, and within 20 minutes he was in an ambulance. He had a cardiac event. He recovered, but the outcome could have been very different if he’d pushed through that “mild discomfort” for another 30 minutes.
Knowing when to stop isn’t weakness. It’s the skill that keeps you in the game long-term.
- Chest pain, jaw pain, or left arm numbness during exercise = stop immediately and call 911, no exceptions.
- Dizziness that persists for more than 30 seconds after slowing down is a red flag, not normal exertion.
- Sharp joint pain (not muscle fatigue) during a movement means stop that movement, period.
- New shortness of breath that's disproportionate to your effort level warrants same-day medical contact.
- "Pushing through" works for mild muscle burn; it's dangerous logic applied to cardiac, neurological, or joint pain.
The Warning Signs That Mean Stop Right Now
Let me be direct about this category, because the research here is unambiguous and the stakes are too high for nuance.
Stop exercising immediately and call 911 if you experience chest pain or pressure, pain radiating to your jaw, neck, or left arm, sudden severe shortness of breath that doesn’t ease when you slow down, a feeling that something is “very wrong” (that gut signal is clinically documented and worth taking seriously), sudden confusion or slurred speech, or loss of balance that comes on fast and without warning.
The American Heart Association’s current guidance (and as of 2026, this hasn’t changed) is unambiguous: these are not “talk to your doctor at your next appointment” symptoms. They’re 911 symptoms. The reason I list jaw and neck pain alongside chest pain is that many people, and this surprised me when I first learned it, experience cardiac events with almost no chest involvement. Women in particular are documented to present with atypical symptoms more frequently. I’ve repeated this so many times in sessions that some of my clients can recite it back to me, and I’m glad they can.
One more thing in this category: if you feel faint or actually faint during exercise, don’t let anyone tell you it was just dehydration or getting up too fast. It might be. But in adults over 60, exercise-induced syncope or near-syncope needs a medical evaluation before you exercise again.
The Signals That Mean Slow Down and Pay Attention
This is where the judgment calls live, and I’ll be honest: the research here is genuinely more mixed. These warning signs don’t automatically mean danger, but they mean you stop the current activity and assess.
Dizziness or lightheadedness. This one is common and commonly dismissed. Some dizziness when you stand up quickly is postural hypotension and is fairly benign, especially if it resolves within 15 to 20 seconds. But dizziness that hits you mid-exercise, while you’re already moving? That’s different. When I’ve seen this in clients, I always have them slow to a complete stop, sit down (not stand there), and wait a full two minutes before deciding anything. If it clears quickly and doesn’t come back, we might continue at a lighter intensity. If it lingers, we’re done for the day.
Pain that’s sharp, not burning. Here’s the distinction I teach every client: muscle fatigue burns. Joints that are being worked feel pressure. Neither of those is reason to stop, as long as the intensity is appropriate. But sharp pain, stabbing pain, pain that makes you flinch or hold your breath, that’s your body flagging something structural. I made the mistake early in my career of letting a client continue through what she described as “a little sharp feeling” in her knee. It turned out to be a small meniscal tear that became a bigger one. I don’t make that mistake anymore.
Nausea during exercise. Mild nausea can happen with overexertion. Actual vomiting or severe nausea in someone exercising at a moderate intensity is not normal, and in older adults it can be a sign of cardiac stress. Stop, hydrate cautiously, and if it doesn’t resolve in five minutes, get medical attention.
What “Unusual Fatigue” Actually Looks Like
This one gets overlooked because fatigue sounds like something you’re supposed to expect from working out. And you are, to a point. The fatigue I’m talking about is disproportionate: you’re doing your normal Tuesday walk, maybe 20 minutes at a pace you’ve handled for months, and you feel like you’re moving through concrete. Your legs are heavier than they should be. You need to rest partway through in a way that’s unusual for you.
What surprised me, when I dug into the cardiac literature a few years back, was how consistently unusual fatigue appears as a pre-event symptom in older adults, especially in the days leading up to a cardiac or vascular event. It often shows up 24 to 48 hours before more obvious symptoms. The research from the Framingham Heart Study, one of the longest-running cardiovascular studies in history, identified unexplained fatigue as an early warning indicator worth taking seriously.
This doesn’t mean every tired day is a cardiac warning. You might be under-sleeping, fighting a mild illness, or simply overdoing it. But if the fatigue is accompanied by anything else (slightly more breathlessness than normal, a vague feeling of unwellness), I’d call your doctor that day, not next week.
Here’s a comparison of fatigue types that I use when explaining this to clients:
| Type of fatigue | Characteristics | What to do |
|---|---|---|
| Normal exercise fatigue | Muscle burn, heaviness that improves with rest, resolves within an hour | Continue or reduce intensity |
| Overtraining fatigue | Soreness lasting more than 48 hours, general tiredness across multiple days | Rest 2-3 days, reassess program |
| Unusual disproportionate fatigue | Far more tired than effort warrants, during your normal routine | Stop activity, call doctor same day |
| Fatigue plus other symptoms | Any combination with dizziness, nausea, arm discomfort, breathlessness | Stop immediately, call 911 or seek urgent care |
The Mistakes I See Constantly
Gerald’s story is one. Here’s another pattern I’ve observed dozens of times: someone notices that their balance feels off during a session, maybe they wobble on a single-leg stand they normally handle fine, and they chalk it up to a “bad day.” They finish the workout. They go home. The next day they feel fine. And they never mention it to their doctor.
The thing is, a single episode of unexplained balance disruption in an adult over 65 can be an early neurological signal worth investigating. It might be nothing. But it also might be early peripheral neuropathy, a medication interaction (beta-blockers and diuretics can both affect balance in ways that are dose-dependent and fixable), or something vestibular. These are all addressable if caught early.
I thought for years that the main job of a fitness professional working with older adults was to push people appropriately. I’ve revised that view. Half the job is knowing when not to push, and being specific enough about why that the client actually believes you.
Scenario 1: A 68-year-old woman reports sharp knee pain during leg press at 40 lbs. Action: stopped immediately, switched to seated leg extensions with zero resistance to test range of motion without load. Result: discomfort resolved, but she was referred to her orthopedist, who found early-stage osteoarthritis and adjusted her program accordingly. She’s been training consistently for three years since.
Scenario 2: A 74-year-old man feels unusual arm heaviness during a morning walk. Action: walked him to a bench, had him rest, called his wife, contacted emergency services. Result: confirmed mild cardiac event in the ER. Cardiologist later said the early response likely prevented a more serious outcome.
Scenario 3: A 70-year-old woman with well-managed hypertension experiences dizziness during a warm-up that resolves in 45 seconds. Action: reduced warm-up intensity, monitored for recurrence, contacted her physician that afternoon. Result: physician discovered her beta-blocker dose had been increased the previous week and adjusted accordingly. No further incidents.
A Note on Medications and Exercise
This deserves its own conversation, honestly, but briefly: if you’re on beta-blockers, ACE inhibitors, diuretics, or any blood pressure medication, your physiological response to exercise is different from someone who isn’t. Your heart rate will not rise the same way. Your RPE (rate of perceived exertion) becomes more important than your pulse as a guide. And some side effects, dizziness, unusual fatigue, lightheadedness, overlap with the warning signs above in ways that require medical guidance to sort out. Please tell your trainer what you’re on. I can’t count the number of times I’ve discovered mid-session that a client was on a new medication that directly affected how we should be reading their symptoms.
Sources
- American Heart Association (2026): Exercise guidelines and cardiac warning signs for older adults. heart.org
- Framingham Heart Study (ongoing, data through 2025): Longitudinal data on cardiovascular event precursors including fatigue and prodromal symptoms. framinghamheartstudy.org
- ACSM’s Guidelines for Exercise Testing and Prescription, 11th Edition: Comprehensive clinical guidance on exercise contraindications, absolute and relative, for adults with chronic conditions
- National Institute on Aging: Exercise and physical activity recommendations and safety guidance for adults 65 and older. nia.nih.gov
- Journal of the American Geriatrics Society: Multiple peer-reviewed studies on syncope, fall risk, and cardiovascular symptoms during exercise in older populations
Photo: Kampus Production via Pexels
This article is for general informational purposes only and does not constitute medical or fitness advice. Consult your physician or a licensed physical therapist before starting a new exercise program, especially if you have existing health conditions.
