From Fehr Trade:
This is a digital sewing pattern for close-fitting, workout leggings with contrast swirl design on the upper front thigh leading to the upper back. There’s a hidden pocket inside at the upper centre back, perfect for gels, keys, or your phone, and contrast panels at the back of you knees are perfect for mesh fabrics. An elasticated, high-rise waistband means they won’t shift around as you move, either!
Intermediate sewing skills are required for this pattern - some experience with sewing knits is expected. Note that this pattern requires stretch jersey fabric with good recovery - it is drafted with negative ease!