Opinions expressed by Entrepreneur contributors are their own. Tim S. Grover, known for his work with elite champions, wrote a book aptly titled Relentless, chronicling his training career and how he ...

Tim Grover is the gold standard of legendary NBA trainers, with a star-studded client portfolio that included Dwyane Wade, Michael Jordan and the late great Kobe Bryant. Unknowingly to most, however, ...

Grover ( Jump Attack) spends half of his second book making a sales pitch for his sports-performance training services (at Attack Athletics in Chicago), and the other half lamenting the fact that most ...

Personal trainer Grover (Relentless: From Good to Great to Unstoppable) dazzles with his tough-love take on reaching greatness, bluntly advising there are no shortcuts to success: "I know it's common ...