I am almost 2 years post op 2 level lumbar fusion. Low back pain has improved but still having issues with back muscle tightness/muscle fatigue. Exercise regularly, weights, walking, yoga. Advice?

Everything Right. It sounds like you are doing everything right. Surgery is traumatic to the spine and muscular tissue. There can be irreparable damage as as result. Overall, it sounds like surgery was a success because you have an active lifestyle. I would recommend a short course of physical therapy so they can discuss your goals and deficits you have. You may be doing the wrong exercises. Discuss with doc.
Stretch. Before exercising. This is really important as it will help increase your strength as well as decrease injury. Get a loved one to give you a massage or get a professional one on a regular basis.

Related Questions

17 months post op two level lumbar fusion (xlift). I walk, do yoga, and core exercises. I am still experiencing muscle tightness, fatigue, spasms. What else can I do to improve these symptoms?

Inversion chair. . Did you try statching, inversion chair and swimming . Do it under the guidance of physician or trainer. Read more...
Pool therapy. Aqua, or pool therapy, can be very beneficial in loosening up tight low back muscles, while eliminating the effects of gravity while you exercise. Read more...
TENS unit. You are doing a commendable job of doing the essential things. Consider use of a neuromuscular stimulating unit or a transcutaneous electrical nerve stimulating (tens) unit. Read more...
Re-evaluation. Lumbar fusion may take up to 2 years to heal completely. Nonsteroidal anti-inflammatories, a mild muscle relaxant, physical therapy may be options. Consider re-evaluation by your surgeon to be certain that the fusion is healing appropriately. Read more...