Possible Clues:

• Former singers last to go forward, one stretching a leg?
• To limit injuries finally exert no wrenched muscle
• Old mate's all fingers and thumbs -- and toes? Instead, perhaps, muscle
• Muscle torn fooling with sex close to bedtime
• Muscle from flipped-over eggs -- a hundred possibly eaten?
• Kinky sex tore new muscle
• Muscle area endlessly painful, energy lacking
• Rose next exercising muscle
• Muscle former singer used to carry spades