On theme with C2’s interchangeability, models D or E are essentially the same machine. When we talk about one we’re talking about both. The Concept 2 E is just 8 pounds heavier but is made out of stronger stuff all around — what’s plastic on the model D is aluminium on the model E, and what’s aluminum on the model D is welded steel on the model E. The only noticeable variations are seat height and display position.
Comparing the rowing machine to the stationary bike, the rowing machine is superior in terms of calories burned. Yet, it’s important to note that the stationary bike is also easy on the joints and only includes the lower body. So, if you have any upper body problems then the stationary bike will be a much better choice. In 30 minutes of cycling 12-13 miles per hour, an 125lb individual will burn around 225-250 calories.