You’€™ve just got to have a mindset basically every single day that you’€™re going to go in, work hard and you’€™re going to get better,” Gronkowski said. “Definitely going in when it’€™s the same thing 15 weeks straight, it starts to get tough, but you’€™ve got to stay mentally tough, stay physically strong. You’€™ve got to just keep going in and keep grinding.