Bring your left hand forward and right leg, then right hand and left leg so you crawl forward along floor.

Crawl forward the length of your exercise mat before crawling back.

What other searchlights, my friends, what other harmonies, sweep across our world while we - unknowing as the crab and cat - crawl forward sightless, deaf and unfeeling?

He crawled forward under cover of a low wall while his team provided covering fire and acted as a diversion.

Although painfully wounded, he refused to be evacuated and on his own initiative crawled forward alone until he reached a position near an enemy emplacement.