I'm not convinced that is sciatica, but you likely have some other spinal condition that impinges on tissue with that activity. If you've done your rest, stretches, local care (ice, heat, ointments whatever), and you still have knife-like pains after a couple of months it deserves professional review.
was jogging about 20 + miles a week and jumping a lot of rope and surfing a lot
with the surf season starting in the last month i have barely ran or jumped rope - just surfing lots
back way better w/o jogging and jumping rope