If I Resume Running After 2 Weeks Post Thigh Liposuction Will I Damage Myself?

The questions that you ask are quite proper and important for your particular situation. However, you should ask your operative surgeon these questions as he/she was the one who performed your surgery and there are variabilities of recommendations for post op activities among physicians. No one answer is necessarily right or wrong. The answer would also be influenced by your particular procedure (volume removed) and your general medical condition (which apparently is excellent).

For most of my patients, I would recommend waiting around two and a half to three weeks before resuming extremely vigorous activities such as long distance running.

As a half marathoner, you will not hurt yourself if you go back to running too soon. The liposuction injury to the tissue is much like a bruise or contusion over a larger area, not muscular or ligamentous injury that haunts runners. If you run, use support, exercise just up to the point of soreness, and remember you might prolong your swelling. You could try swimming, cold water is nice, but there is nothing like a good run. Damage is unlikely but use caution.
Best of luck,
peterejohnsonmd