article_snippet: Stage 1 - 1.7 mph/10 per cent grade/5 METs .
article_snippet: Stage 2 - 2.5 mph/12 per cent grade/7 METs .
article_snippet: Stage 3 - 3.4 mph/14 per cent grade/10 METs .
article_snippet: Stage 4 - 4.2 mph/16 per cent grade/13 METs .
article_snippet: Stage 5 - 5.0 mph/18 per cent grade/15 METs .
article_snippet: Stage 6 - 5.5 mph/20 per cent grade/18 METs .
article_snippet: Stage 7 - 5.5 mph/22 per cent grade/20 METs .
article_snippet: Stage 1 - 1.7 mph/10 per cent grade/5 METs .
article_snippet: Stage 2 - 2.5 mph/12 per cent
article_snippet: Stage 3 - 3.4 mph/14 per cent grade/10 METs .
article_snippet: Stage 4 - 4.2 mph/16 per cent grade/13 METs .
article_snippet: Stage 5 5.0 mph/18 per cent grade/15 METs .