Iliotibial band syndrome causes pain on the outside of the knee, typically in runners and cyclists. It often starts at a predictable point in a run and gets worse downhill.
What is commonly recommended:
Reduce the aggravating load (distance, downhills, long descents on the bike) rather than stopping all activity
Strengthen the hip muscles, especially the abductors and glutes; weakness here is a frequent finding, though not in everyone
A small increase in running cadence, around 5-10%, may reduce load at the knee for some runners
The band itself is very stiff tissue; foam rolling it may feel good but does not “stretch” or lengthen it
A simple progression many runners use: flat routes only, at a distance you can complete without pain, for a week or two. Then add short gentle hills, then longer runs. If the pain comes back at the same point, ease off a step.
Pairing that with 2-3 sessions a week of hip strength work tends to work better than either alone.