Possible Clues:

• Work up in track apparatus used by gymnasts
• River in public transport route can be jumped over!
• Vagrant's old job being a bouncer
• It makes for resilience to set up market on River Nile, perhaps
• The performer's bound to be uplifted by it
• Bouncers may work on it
• Hop on it!
• Useful accessory for spring?
• Later on, I worried about member's gymnastic apparatus
• Track crossing river one used to exercise on