Having big muscles, ability to run for long distance or do triathlons does not necessarily mean absence of disease.
Such persons may be healthy in some aspects, no doubt; but not immune to diseases.
Otherwise all athletes, wrestlers would be beaming with health all life. But that’s not the case definitely.

Thousands of years ago, the secret to health is summarized by Guru Vagbhatta in his treatise Ashtanga Hridaya (meaning: About all 8 bodies) in Sanskrit as below:

नित्यं हिताहारविहारसेवी समीक्ष्यकारी विषयेष्वसक्त: ||

दाता सम: सत्यपर: क्षमावानाप्तोपसेवी च भवत्यरोग: ||

Meaning: One who always chooses right food and regimen, is objective, has control on senses and is truth-speaking, values wisdom and, has patience and serving attitude will never be affected by diseases.

-Vagbhatta Sutra (4:36)

The secret to health is straightforward.

Is it simple? Yes
Is it profound? Oh yes
Is it easy to implement? Hmmmm………………………………That’s where Ayurveda helps.

Does that mean- even if such a person gets bugs, they won’t fall sick?

Yes, as their immunity would be strong enough to win against any bugs.
Their body systems would be functioning optimally, so there would be no imbalances leading to disease conditions from internal or external causes.

They would be in prefect balanced state of body and mind.

But where to find such a person?
That’s the challenge in today’s world, right?

But let’s look at it another way.

How the person with these qualities would be?
They would be calm, peaceful, right?
And that’s what Ayurveda says - Health gleans from calmness, peace.

Reflect deeply about it and we will understand the profoundness underlying this secret.
Ayurveda also provides the tools to achieve this state of calmness, state of health.

Simple, profound tools which one can implement with some practice, perseverance and patience.