Lounges at George Bush Intercontinental Houston Airport

You can get your shoes shined in the following locations:

Terminal B, airside, near gates B76-83
Terminal C North, airside, near gates 14-23
Terminal C South, airside, near gates 43-45
Terminal E, airside, near gates E10-11

Cost are about USD 4.00.

You'll find coin-operated massage chairs in the following locations:

Terminal A: In the ticketing lobby, in the food court area (North), and near gates A26-27 (South)
Terminal B: Near gates 60-67, 68-75, 76-83 and 84-91.
Terminal C: Near gates C14-23 (North).