When can I start weights and a spin classes after a full tummy tuck?

Thank you for your question. The best person to advice you is your specific surgeon as every surgeon will have his/her preferences as to recovery for specific procedures. Usually, patients can return to light activities almost immediately after surgery, normal activities 2 weeks after surgery, and vigorous exercise 4 weeks after surgery.  We usually experience a slow steady improvement for 3 months or so after surgery.

Congratulations on having undergone the tummy tuck procedure. Always best to run these types of questions by your plastic surgeon, who knows exactly what was done, how you are progressing, what type of exercise you wish to return to, and is ultimately responsible for your care.
 Keep in mind that it may be several months before you reach your full strength and stamina.
Generally,  I ask my patients to start walking as of one after surgery.  Most patients are able to return to lower body exercises, such as the use of a stationary bike, 2 to 3 weeks after surgery.  I ask my tummy tuck patients to refrain from any heavy-lifting or strenuous exercise for 6-8 weeks to prevent any complications and ensure proper healing.    Abdominal wall workouts can usually begin about 2 to 3 months after surgery, depending on how the patient is progressing etc.
Best to “go slow” and listen to your body as you gradually increase your activity level. Best wishes.