Can i increase my metabolic rate through exercise even after a total thyroidectomy?

Thyroidectomy: After a total thyroidectomy your doctor must have put you on thyroid medication. It may take a few weeks/months to optimize the dose but after that you should be stable. I would slow down the exercise a bit till your thyroid levels are stable.

Yes: Hi. Yes, you can. Most thyroidectomies are done for thyroid cancer. You will need to take thyroid hormone replacement for life, but doing so, your thyroid hormone-influenced metabolic rate will be normal. Increasing your metabolic rate through exercise is a different mechanism than the basal set point that thyroid hormone helps regulate. Take your thyroid hormone, eat healthily, and exercise.