Wel from what i read on here like doing shorter spans of cardio but with higher resistance is better i am near your weight 216 i was 225 when i started a monthago and i really noticed going with a 25 minute span on the elliptical but doing higher resistance (or higher incline with tredmills) is better cause you push harder than just going at a slower steady pace for a long period of time, just more efficient i believe, plus i started doing more muscle toning even tho you cant see them yet it will help burn more calories as you build muscle. cause muscle just requires more calories to exist than fat.