Question about nerves? My body begins to tremble after 30 seconds?

huh Asked: Question about nerves? My body begins to tremble after 30 seconds?

I am in my early 30's and always been on my feet, I still have yet to every purchase a vehicle because the metropolis that I live at rarely has room to park vehicles and has reliable public transportation. My career for the past 10 years also required me to stay on my feet.

I am 6 feet tall

My Question is about my nerves I have attempted to hold my body for 60seconds off the floor –in plank position– wearing sneakers and proper shorts and a t-shirt for excising. I attempted to hold my body for 60 seconds and at the beginning of 30 seconds my body begins to tremble. What can this be??

Yes everyone tells me

GO 2 THE DOCTORS
GO 2 THE DOCTORS

but I don't have enough income for a physical or proper test to be done.

I can walk, talk, run, hop a bike do everything normal but when I begin to lift weights –40 pounds weights– or life a tray of food my arms and hands begin to shake.

I eat reality healthy I am fairly skinny waist size is 36

any idea what this can be???

I would rather call a doctor with an "assumption of what I think it is" rather then have to waist endless money that I DON'T HAVE to get a clue of what it can be

so is there any ideas of what this can be??