What skilled trade can I do for someone who is not physically strong?

Penile lifting. Much needed.

There many simple production and assembly jobs that do not require heavy lifting.  A plumbers assistant is also possible.  A carpenter job is likely going to require a bit of lifting, but not necessarily.  A machinist job would be a good job to consider.  In any case, good luck.

Small electronics repair comes to mind. You'd probably never have to lift anything larger than a computer console. Simply learning electronics would be a great asset--then you could limit your work to smaller items. 

I don't understand how you should like the sweat,Can you share with us the reason why you don't like office job ?  since you went to college ,then you should look for a decent job ,I think that if you don't really want to work in office and learn a trade ,then you can go for what kinds of field you like ,if you settle on this field ,then you should do the job well 

Your first step is to understand and be able to explain what you mean by 'not physically strong'. It's important to get this straight, because when you talk to an employer eg. apply for a job, they will want to know what you can do, and what you can't do. 

You don't have to be super fit to do many trades, but of course you do need to be able to be on your feet, bending and kneeling,up a ladder, handling tools, lifting and moving building materials etc, etcI think you should do some research into different trades, so that you can see what the work involves, the experience, skills and training you need to get into them.One thing I would add- it can be hard to really make a go of this kind of work without a driving licence, as often the work is in different locations and you will have to carry tools. But some companies provide transport for labourers.

"not physically strong"?

obviously your in need of this 

https://en.m.wikipedia.org/wiki/Charles_Atlas.

dont be that 99lb weakling on the beach! stand up for yourself!

In any trade you need to be as durable as the trade requires or you will be unhappy and unable to do the job.

I suggest hiring a 'man' as an aid if you feel or know you might fall through physically.

whats wrong with tradesmen hiring labour? its common practice. I only said "man" cause batman had one, alfred.

snicker, notice the females consider mechanical assistance valid in the "trades".

Maybe a career in printing.  While much of the work has shifted to electronic means, there are still career paths in print shops and book binderies.

Do you have stamina but not strength?

A residential electrician.

Most plumbing is light weight

Heavy machine operator is just driving

If female, hairdressing, nail technician, florist.

If Male, electrician , gardening .

you can get physically strong with exercise. increase your stamina gradually and soon you will be strong. truck driving doesn't require physical strength.