263 lb 36 year old male, seeking to lose weight after back injury. Currently using elliptical machine, 30 minutes per day, high cardio range, but low impact. Have temporarily abandoned weight training. Experiencing mild burning sensation and ache in lower back hours after exercise, and mild increase in associated leg "tingles" (bilateral). Is this a warning to decrease intensity and / or duration of workout? Would very much prefer to continue, but also very much want to avoid aggravating condition. Exercise is indicated for general therapy of back injury, but is the burning sensation normal?

Any advice or personal experiences would be appreciated.

Regards,