active adults alongside backpacks bicycles bikes crash-helmets cycle cycling cyclists energetic energy environmentally-friendly exercise fit fitness helmet helmets movement moving on-the-move outdoors outing path pathway pedal-power pedalling pedals pushbikes recreation safety safety-helmets shade shadows sport sporty sunlight sunshine track transport transportation travel travelling trees wheels youth adult children daughters mother parent park public son accommodation balconies group housing Morning palms prepared road spokes blue clothing hat headgear plastic work green hard hat headwear protection boy child confidence crash-helmet cyclist learning supervised trainer-wheels youngster building building construction chinese Chinese architecture confined confined space construction construction site flame flare heat helmeted safety harness welder welding worker working workmen attention caution danger logo pictogram security sign warning workmanship