Even at 44 and after childbirth, beauty icon Son Ye Jin continues to amaze the public with her slender, toned physique. The secret lies in her rigorous training regimen and a scientific approach to diet.

A devoted exerciser

If you believe celebrities only visit the gym for check-in photos, Son Ye Jin proves otherwise. She is so dedicated that she obtained a professional TRX instructor certification, Cosmopolitan reported.

The actress has maintained this discipline for over one decade, even bringing her suspension trainer with her when filming abroad. TRX utilizes body weight as resistance, effectively training deep core muscle groups.

She also combines TRX with Pilates for stretching and creating soft contours. This approach ensures her body is not frail or lifeless but toned and healthy. Son Ye Jin also plays tennis, a high-calorie-burning sport that demands full-body coordination.

Regardless of her busy schedule, she dedicates at least one hour daily to exercise, making physical activity an essential part of her life.

Son Ye Jin at the Blue Dragon Awards, 11/2025. *Sports Q*.

Diet philosophy: weight loss does not mean starvation

Many people choose starvation for weight loss, but Son Ye Jin says "no" to this extreme method. As a food lover, she believes life cannot be without delicious meals. Instead, she applies a scientific approach to dietary control:

16:8 intermittent fasting: She maintains a consistent eating window to allow her digestive system sufficient time for metabolism.

Prioritizing whole foods: She opts for green vegetables, fish, and lean meat, which are foods kept in their natural state.

The "give and take" principle: If she indulges in a meal one day, she ensures to double her workout the next day to "repay" the calorie debt. This mindset helps her maintain an ideal weight without enduring the hardship of strict diets.

During weight loss phases, she prioritizes a menu rich in protein and gentle on the stomach, such as seaweed and seafood.

The two-liter water rule daily

This habit seems simple, yet few practice it consistently. Son Ye Jin specifically emphasizes drinking two liters of water daily to maintain skin hydration and boost her body's metabolic rate.

Notably, she almost entirely avoids cold beverages because a drop in body temperature can slow down metabolism and easily cause swelling. When the circulatory system functions smoothly, the body naturally exudes a rosy, radiant appearance, even without makeup.

Ye Jin in the film 'Thirty-Nine' (2022). *Naver*.

Back training menu

At international red carpet events, Son Ye Jin consistently makes headlines with her backless gowns. The secret to her elongated and graceful body proportion, despite her 1,65 m height, is her focus on back muscles.

Before important events, the actress often follows a special two-week training menu to enhance upper body firmness:

Resistance band back exercises: These activate the latissimus dorsi muscles, improving rounded shoulders and hunchback posture.

Bodyweight row: This exercise increases thickness and stability in the middle back.

Reverse fly: This sculpts the contours of the upper back and improves scapular control.

Back training helps improve posture, creates a "square shoulder" effect, and makes the upper body appear thinner and more youthful. This is a crucial anti-aging "weapon" that is more important than squatting.

Ultimately, achieving a figure admired by many in one's 40s requires persistence and remarkable self-control. Instead of seeking rapid weight loss, start today by drinking a glass of warm water, walking more, and focusing on posture exercises.

By My Y (According to Cava, Cosmopolitan)