My sister-in-law’s in her 50s & has one of the best bodies I’ve ever seen – she has a monthly habit & being single helps

HAVING the best body someone's ever seen is pretty high praise — and even more impressive when you're in your 50s.

One woman says her sister-in-law's got a fantastic figure and revealed how she stays in shape — including a monthly habit that really helps.

"My sister-in-law is in her mid-50s and she has one of the best bodies I've ever seen, hands down," Redditor said.

While she may have been blessed with good genes, Egriff78 said she also sticks to a tough routine to keep her body looking amazing.

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Her sister-in-law's recipe for success starts in the kitchen.

"She is very strict with her diet," she said.

"She lifts heavy in the gym and has monthly blood tests to ascertain her vitamin [and] hormone levels."

recommends getting hormones checked for a variety of conditions, including menopause.

Abnormal fluctuations in hormones can cause issues like weight gain.

A vitamin deficiency test may also prevent or explain uncomfortable symptoms.

The sister-in-law is also single and child-free, which frees up her schedule.

"[She] dedicates a ton of time to her diet, workouts, lifestyle, [and] trainer who supports her," the Redditor said.