# JELENS J10 Adjustable Leg Curl and Extension Machine

Source: https://www.ranked10.co.uk/fitness/best-leg-extension-machines/jelens-j10-leg-extension-curl
Ranked #2 in "Best Leg Extension Machine 2026: 10 Ranked, and the Capacity Claims That Don't Add Up": https://www.ranked10.co.uk/fitness/best-leg-extension-machines

- Price: £630.04 (checked on Amazon UK on 2026-09-16)
- Amazon rating: 4.4 from 106 ratings
- Buy on Amazon: https://www.amazon.co.uk/dp/B0FM7SBNQK?tag=ranked10-21

The JELENS J10 is a leg extension and curl machine for home gyms, and it takes the number 2 spot in this guide. It is listed at £630.04 with a 4.4 out of 5 rating from 106 ratings, and it is the one machine in the line-up whose capacity claim survives its own specification page: a bullet describes a reinforced, heavy-duty steel frame that "supports users up to 440 lbs", and the specification field headed Tension Supported says 440 pounds. Same figure in both places.

What that 440 lb does not tell you is how much plate the arm will take. It is a frame rating, the same kind of top-line number the other listings in this guide dress up, and the JELENS listing never states a sleeve diameter — one reviewer reports the J10 fits both 1-inch and 2-inch plates and notes he found that in the videos rather than in the written description. Two smaller quirks worth reading twice: the colour field reads "Red – No Additional Weight", and the five rows of the star breakdown (67, 16, 11, 3, 3) add up to 100 while the page reports 106 ratings. Everything on this page comes from the JELENS J10 listing as it appears on Amazon, not from our own testing.

## Specification

| Field | Value |
|---|---|
| Price | £630.04 |
| Rating | 4.4 out of 5 from 106 ratings |
| Star breakdown | 67 five-star, 16 four-star, 11 three-star, 3 two-star, 3 one-star — the five rows add up to 100 |
| Tension Supported | 440 pounds |
| Capacity in the bullet | Supports users up to 440 lbs |
| Item Weight | 34 kg |
| Item Dimensions D x W x H | 120D x 76.5W x 106H centimetres |
| Colour (as listed) | Red – No Additional Weight |

## Questions people ask

**Does the JELENS J10 really support 440 lb?**

The bullet says the frame supports users up to 440 lbs and the specification field "Tension Supported" says 440 pounds, so the two figures agree. That is a rating for the frame, not the weight you set on the arm of the machine.

**What plates fit the JELENS J10?**

The written listing gives no sleeve diameter and no plate size at all. A reviewer, Steve Belcher, reports that the machine takes both 1-inch and 2-inch plates and says that detail appears in the videos but not in the text.

**What comes in the box?**

The Included Components field lists one item, a user manual, and Number of Items is 1. The colour field reads "Red – No Additional Weight", and no plates are listed among the included components.

**How much space does the JELENS J10 take up?**

The listing gives 120D x 76.5W x 106H centimetres and an item weight of 34 kg. JELENS describes the base as widened and H-shaped to reduce wobble and shake during use.

**Is it a leg extension machine or a leg curl machine?**

The JELENS J10 name covers both: it is sold as a leg extension and curl machine, and a bullet describes switching between a seated leg extension for the quadriceps and a lying curl position for the hamstrings.

**Can one person assemble it?**

Buyers in the reviews say so. One describes assembly as "just six easy steps", another reports about 20 minutes, and a third says she put it together on her own without problems.