Glossary · Dr Sin Yong’s protocols

4K Body Lift:
what the term means

Medically reviewed by Dr Sin Yong · Last reviewed · 3 min read

A muscle-stimulation device such as those built on HIFEM treats a different layer.

Published 10 October 2026 · Reviewed by Dr Sin Yong

Illustrative cut-away of skin layers glowing in warm amber light — not a patient

4K Body Lift is Dr Sin Yong's high-definition body sculpting protocol on the Secret DUO platform. It uses radiofrequency only, combining insulated-needle RF microneedling with the platform's fractional RF mode for skin tension and texture on the abdomen, flanks, arms and thighs. It does not use EMS or electromagnetic muscle stimulation, and fat reduction, where that is the main problem, is planned separately.

Key facts
Platform
Secret DUO (now a CLASSYS platform; FDA filing by ILOODA); radiofrequency only
Components
Insulated-needle RF microneedling + fractional RF
Not
EMS or electromagnetic muscle stimulation; not a fat-removal method on its own
Zones
Abdomen, flanks, arms, inner thighs and more

Where the 4K Body Lift matters on this site

The 4K Body Lift is named on several body pages, each covering a different decision. The protocol page explains the method; the concern pages explain when it is chosen over the other two body protocols and when something else is needed.

A pocket that pinches and a fold that hangs are two different problems; the 4K Body Lift is for the first, and I will not use it to pretend it solves the second.— Dr Sin Yong

Read the concern page for your area first; the protocol page makes more sense once the pinch test has told you which layer is the problem.

Not to be confused with

Four body terms on this site sound alike and are regularly mixed up in enquiries. Each acts on a different layer.

A useful shorthand: Figure Lift for skin that hangs, 4K Body Lift for fat that pinches, HIFEM for muscle, and surgery for volumes none of these should pretend to handle.

What decides whether the 4K Body Lift is the right tool for you

The decision is made in person, not from a photograph. Dr Sin Yong starts with the pinch test on the zone that bothers you.

Where the picture is mixed, which is common on the abdomen after pregnancy or weight change, the protocols are sequenced rather than stacked, and the plan is reviewed as the tissue responds. The consultation process page explains how that assessment runs.

Where it fits

Full page: 4K Body Lift; the needling component on Secret DUO for the body.

Frequently Asked Questions

Secret DUO is the platform; the 4K Body Lift is Dr Sin Yong’s protocol on it for body zones, combining insulated-needle radiofrequency microneedling with the platform’s fractional RF mode. Secret RF on the face, for pores and acne scars, uses the same needle technology with different depths and settings, so the two are related but not interchangeable.
Yes, where the pinch test shows both a compact fat deposit and skin that has lost recoil in the same zone. The two are sequenced rather than done together, usually skin first, and the order is decided at assessment and reviewed as the area settles.

No. It is radiofrequency only.

Fat reduction is planned separately; the 4K Body Lift is for skin tension, contour and texture.

References

US FDA 510(k) summary K170325 — Secret RF (ILOODA Co., Ltd.), 2017: bipolar 2 MHz, needle depth 0.5–3.5 mm in 0.1 mm steps. source

US FDA 510(k) summary K202043 — Secret DUO (ILOODA Co., Ltd.), 2021. source

Chandra S, et al. Physics of fractional microneedle radiofrequency. J Cutan Aesthet Surg. 2024;17:177. doi:10.25259/jcas_98_23 (PMID 39483649). source

The Landscape of Radiofrequency Technology for Skin Rejuvenation. Health Science Reports, 2025. pmc.ncbi.nlm.nih.gov

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