Exercise intolerance

Why does exercise make me crash?

If activity costs far more than it should—or symptoms arrive hours later—the answer may not be “push harder.” Map your pattern before choosing Zone 2, HIIT, strength training, or a heart-rate target.

Check my crash patternGet the plain-language answers
Quick pattern check

What happens when you exert yourself?

Choose the closest answer. This is educational and does not diagnose a condition.

1. When do symptoms worsen?
2. How long does recovery usually take?
3. What can trigger the pattern?
4. How much does it disrupt normal life?
Your free preview

Your pattern preview

—
Crash sensitivity

Pause and seek medical guidance for chest pain, fainting, severe breathlessness, a new irregular heartbeat, or sudden weakness. Heart-rate limits and exercise prescriptions should reflect your diagnosis, medications, and testing.

Build my personalized Mito MapFree account · Save your pattern and next steps
The questions people ask

Exercise advice is not one-size-fits-all.

The useful target is activity you can repeat and recover from. A generic zone or workout label cannot tell you that by itself.

1

Should I exercise?

Often, some movement is valuable—but the right dose depends on diagnosis, current function, symptom response, and whether exertion causes delayed worsening.

2

Zone 2 or heart-rate limits?

Heart rate can be one signal, not a universal safety line. Medications, dysautonomia, heat, illness, and mitochondrial disease can change what the number means.

3

HIIT or strength training?

Intensity may help some people and destabilize others. Establish a repeatable baseline first, then test one small change while tracking recovery.

Your pattern, connected

See how exertion fits your whole energy picture.

Mito Map connects symptoms, activity, recovery, interventions, and function over time.

Start my free Mito Map

Educational information only. This page does not diagnose, prescribe exercise, or replace individualized medical care.