Possible Clues:

• With 72-Across, motto of a fitness trainer?
• Bands want to blow this, not their amps
• See 49-Down
• With bombs around, I say take care
• Be careful. It's booby-trapped, according to reports
• Intellect in 1500
• Take offence (at)
• See 3
• __ Reader
• With 21-Across, extreme will power, literally