Hi. 61 year old. 2 previous heart attacks rebored and stented, overweight 6foot was 21 stone lol dare I say not as fit as I could be. Plan do something about it. Implementation dug out old Raleigh record not used for thirty years, managed 2 miles 1 mile downhill fast due to weight, forgot to check brakes (an age thing) 1 mile uphill slow due to pushing bike. Assessment need to do more work. Result after 5 month's lost 3and half stone can now manage12 mile cycle slowly (two hour's 45 mins) can cycle up hills in stages refuse to push bike, thought's get an e bike as now fit enough to cycle with the extra weight in unassisted mode until absolutely required. Thinking carrera crossfire reviews generally good for price aware of reported cut out problems but most owners still seem to rate them, aware I should continue to lose weight and general fitness should improve and an ordinary bike might be way forward, however like the thought of battery back up. Does but this make sense would value opinions either way. My part of Ayrshire is either uphill or downhill not much flat around