511. Skiing, Cross-Country, 5.0-7.9 mph, Brisk Speed, Vigorous Effort 512. Skiing, Cross-Country Skiing, Ice Skating 513. Skiing, cross country, >8.0 mph, elite skier, racing 514. Skiing, downhill, alpine or snowboarding, moderate effort, general, active time only 515. Skiing, Cross Country, Hard Snow, Uphill, Maximum, Snow Mountaineering 516. Skiing, Downhill, Vigorous Effort, Racing 517. Skiing, Cross-Country, Biathlon, Skating Technique 518. Skiing, Downhill, Alpine or Snowboarding, Light Effort, Active Time Only 519. Sledding, Tobogganing, Bobsledding, Luge 520. Skiing, Rollers, Elite Racers 521. Snow Shoeing, Moderate Effort 522. Snowmobiling, Driving, Moderate 523. Hand Snow Shoveling, Moderate Effort 524. Snowshoeing, Vigorous Effort 525. Snowmobiling, Passenger 526. Hand-Powered Snow Clearing, Vigorous Effort 527. Sitting in Church, in Service, Attending a Ceremony, Sitting Quietly 528. Snow Blower, Walking and Pushing 529. Sitting and Reading Religious Materials at Home 530. Sitting, Playing an Instrument at Church 531. Sitting in Church, Talking or Singing, Attending a Ceremony, Sitting, Active Participation 532. Standing Quietly in Church, Attending a Ceremony 533. Standing, Singing in Church, Attending a Ceremony, Active Participation 534. Walking, 3.0 mph, Moderate Speed, Not Carrying Anything 535. Walking, Less than 2.0 MPH, Very Slow 536. Standing, Talking in Church 537. Walking, 3.5 mph, Brisk Speed, Not Carrying Anything 538. Church Walk 539. Kneeling in Church or at Home, Praying 540. Table/Stand Combination for Religious Purposes, Usher