The fitness range, Nola by Addition Elle (the brand Graham also designs super sexy lingerie for), comes in sizes X to 4X and comprises of leggings, yoga pants, sports bras, tops and running jackets.
Graham, who wears a UK size 14/16, is real life proof of Addition Elle's slogan 'Healthy comes in all shapes and sizes'.
The 27-year-old model often shares photos and videos of her workouts with her 969 thousand Instagram followers.
Addition Elle isn't the only plus size brand launching gym-wear, British high street staple Evans is launching its first ever sports line on Wednesday 3 February.
The Evans Active collection will offer a range of stylish separates to "dispell the myth that curvy girls don't hit the gym".
With prices starting from £18, and a mix of body-sculpting and super-comfy fabrics, we reckon this is another range to keep an eye out for.