If I go to the clinic and the doctor writes me a profile saying no PT, can my 1SG make me do PT anyway?

I agree with what the two senior leaders above have said. A profile is not a 'get out of jail free' card. Rather, I issue profiles with the goal of allowing that Solder the greatest freedom of movement without further aggravation of the existing pathology. The Commander has the authority to override temporary profiles (not permanent, as they have been issued by a board of specialists and fall under a Technical Bulletin.) However, like Top just said, that Commander assumes responsibility for the health of that Soldier, and that is not a liability that most Commanders want. If there is any question about the limitations of a temporary profile, Commanders now have the ability as of 1 JUN 2016 to interface directly with the issuing Provider via the eProfile system.

PFC Julie Haas - True, but the OP seems to indicate that wasn't the case. If it ain't in MEDPROS, it ain't a profile.
I'd never bust up a joe because the doctor or PA is lazy. It is very important for the Soldier that any injuries incurred in the line of duty be documented and any aggravation of that injury not be incurred from training. That's what profiles are for.
The goal of any leader should be to get that Soldier healed and back on the line. It isn't just good for the joe, it is good for the unit.

As so many others have said, if the profile is overridden by a command, then the individual who implements the override assumes liability. Having been in the Medical Department for more years than I care to remember, often we have "sick-bay commando"s", who we see almost weekly for an excuse to not PT, those are the ones who are getting pushback from the line companies. Communication between the MD and the Command are critical in these issues.

Hmmmm, well, as a retired 1S, I may have been brought in at a time when things were a bit different, we had sick call after PT hours, sick call started at 0730 because the medics were allowed to keep fit also. With that, it wasn't until sometime after being a SSG that I ended up in a unit that had sick call hours before PT, and yes, Soldiers took advantage of it. We had smart Soldiers, they made friends with the Medics and knew all the protocols, for example, my back hurts gets you 90 days without PT initially. I had a Soldier work his way down from the neck, eventually I was able to make malingering stick with the help of our PA. Right wrong or indifferent, if you can breath, you can likely do something for PT so as not to endanger your fellow Soldiers that will have to carry your weight when you cannot. If you absolutely get injured, go to the emergency room, if you get a cold, go after PT hours, if its something you think may kill you, go to the hospital, but when it comes to your job, do it better than the guy above and below you and things will naturally workout.

PFC Jim Wheeler - Seems like you got yourself a good wife. My wife use to wipe my ass as I was laying in bed dying of Malaria. She has embraced the suck with me. Now living it up as we decide "what's next?" I'm glad you turned out alright. Regardless of what permanent damage I leave this military with. I know its not as bad as those I carried off the battle field in bags. Good day to you sir.

MSG Dan Castaneda - Fair enough.

I think I'm just bitter because I never did what I signed up to do (for better or worse).

Good day to you as well.

Many don't realize that there are very few and far jobs between that allocate time for physical excerice! Think about it, you actually get paid to sweat! Building endurance makes you a stronger person and it sheds stress;

SFC William Sutherland III - I absolutely agree. We don't do organized PT in SF, unless is a team event. However, doing PT is part of my daily duty. Like any other "big boy" I find time to make it happen.