If you don't have toughness, it's not like you can get it just by reading a book. You usually have to persevere through something. Not many people want to pay the price anymore.
Tom Izzo on toughness:
@SMSBFootball tmw 12/26 is Day #1 of Michigan Showcase: PARENT Recruiting Seminar begins at 2:30pm @ Horatio Williams bldg (1010 Antietam Detroit) Pickup @quicklanebowl tickets also during this time. We will be there until 6:30pm. DM me for questions.