how hold is the dd? has she ever been on an exercise bike before or gone spinning? Does she even want to spin: the formal workouts are a bit brutal, or just a workout at her own pace? How much does she think she'd use one? what is your budget? as usual, more you spend, better quality. The gym ones are very durable & come with computer displays, but fundamentally, it's a boring activity by yourself.
If it were me, & she remained keen, I would think towards getting a quality 2nd hand one on Ebay (good resale potential when she gets bored of it).
Thanks, both. She's 15. I do wonder if it's a piece of equipment she'll use for two months and then not but she has a knee issue which means impact sports like football, etc (she had to give up taekwondo) are out. She wants to get fit and increase cardio exercise. I don't want to discourage that. Budget? Well, it'd be a xmas present. I guess a second hand one would be better. Would I be able to pick one up for around £100 or are typically alot more?