You be in the pink of health....or in the peak of good health....or in any other color you choose....but please look at holistic health:

Physical Health
Mental Health
Spiritual Health

....but what is "in pink"....

Today, the phrase "in the pink" means "in good health" --but this has not always been the case....Source: Sensational Color

The phrase originally came out of the English fox hunting tradition where a rider was not granted the right to don the scarlet colored jackets, called "pinks", until he demonstrated superior horsemanship and service to the hunt.

Being “in the pink” meant the rider had reached the pinnacle of achievement in the hunt.

The use of the phrase “in the pink” evolved to be used more broadly to mean "the very pinnacle of" something, but not necessarily the hunt during the 18th century.

This meaning of the phrase is seen in literature beginning in the mid-1700s and continuing throughout the 19th century. It isn’t until the early 20th century that we see the phrase being used with its current associations.

It is unclear how it transitioned into a phrase that is now specifically health-related, but possibly, as it came into use among those not familiar with the hunt, it was thought that
“pink” referred to the rosy glow of the complexion that is indicative of good health.

Wikipedia :
• Pink is the color for embarrassment, because of the pink blushing cheeks.
• Pink is the color for the female gender.
• Pink means one is in a good condition of health. That is why there is an idiom called "in the pink"-- example: These animals are in the pink today.

According to phrases.org ….Why pink has been chosen to epitomise the pinnacle of quality is more likely to do with the Dianthus flower, many varieties of which are called Pinks. It is known that society in the reign of Elizabeth I admired the flowers, hence the first uses of pink with the 'excellent' meaning in that period.
What is interesting to speculate on is why the flowers were called Pinks.

Wishing you... "in pink !!!"