Possible Clues:

• One keeping fit
• Treadmill runs around in circles perhaps
• King retired in wrong residence, without study, one works out
• River, one getting higher, trapping cold swimmer, perhaps
• Fitness fanatic cut out runs without hesitation
• Francesco, Italy's star striker
• Person working out
• At a stretch, it'll tone up the muscles
• Gym member cut out runs without a word of hesitation
• I work out tax return initially without hesitation