Feeling weak during workout?

You probably didn't drink or eat enough water before. That's a symptom of dehydration and hunger, it's not uncommon to miss a meal and then feel weak during a workout. You'll probably be fine tomorrow, just make sure to eat something an hour or two before you do.

You need rest days for recovery. Eating enough carbs, protein? Drinking enough water? Having some salt intake? You should be incorporating about two days a week to allow for recovery downtime. You can treat those days like a pleasure ride, not working up a sweat.

have a energy bar

it could have been u didnt eat well enough

or u trained too long?

dont do more then 45 mins weights

an 30 mins cardio

and it could be your getting sick?

Not enough information.

You might just be coming dow with a cold. In that case, rest.