Stop. Do not play an exercise video.
If saddle numbness, new bladder or bowel change, sexual-function change (erection, ejaculation, or genital sensation), or progressive weakness in both legs started or worsened in the last 14 days, go to an emergency department (US: ED / 911). A class cannot diagnose cauda equina.
If symptoms are older than 14 days and static, or you have both-leg sciatica without those emergency items, or trauma / cancer / fever / unexplained weight loss / infection-risk, see a clinician this week. Still no home stretch.
Pain of 10/10 is an extra stop. It is not proof of an emergency and it is not required for one.