Where can I set environment variables that crontab will use?

Question

I have a crontab running every hour. The user running it has environment variabless in the .bash_profile that work when the user runs the job from the terminal,

Answer 1

Instead of

0  *  *  *  *  sh /my/script.sh

Use bash -l -c

0  *  *  *  *  bash -l -c 'sh /my/script.sh'