421. Walking the dog 422. Walking from Home to Car or Bus and Back, from Car or Bus to Destinations, from Car or Bus to and from Worksite 423. Walking, 3.5 mph, level, brisk, firm surface, walking for exercise 424. Walking, 2.0 mph, level, slow pace, firm surface 425. Walking to Neighbor's House or Family's House for Social Reasons 426. Walking for Pleasure 427. Walking, 2.5 mph, downhill 428. Walking, 2.8 to 3.2 mph, level, moderate pace, firm surface 429. Walking, 2.5 mph, level, firm surface 430. Walking, 2.9 to 3.5 mph, uphill, 6% to 15% grade 431. Walking, 2.9 to 3.5 mph, uphill, 1 to 5% grade 432. Walking, 4.5 mph, level, firm surface, very, very brisk 433. Walking, 4.0 mph, level, firm surface, very brisk pace 434. Walking, 5.0 mph, Level, Firm Surface 435. Walking, 5.0 mph, uphill, 3% grade 436. Walking, for Exercise, 3.5 to 4 mph, with Ski Poles, Nordic Walking, Level, Moderate Pace 437. Walking, Grass Track 438. Nordic Walking, for Exercise, 5.0 mph, with Ski Poles, Level, Fast Pace 439. Walking, Normal Pace, Plowed Field or Sand 440. Walking, to Work or School 441. Recreational Walk, Work Break 442. Walking, to and from an Outhouse 443. Walking, Backwards, 3.5 mph, Uphill, 5% Grade 444. Walking, for Exercise, with Ski Poles, Nordic Walking, Uphill 445. Boating, Power, Driving 446. Walking, Backwards, 3.5 mph, Level 447. Boating, Power, Passenger, Light 448. Canoeing, on Camping Trip 449. Canoeing, Harvesting Wild Rice, Knocking Rice Off the Stalks 450. Canoeing, Canoe Portaging