exercise that is okay to do with scoliosis and tachycardia?

[Alyssa Autopsy]

i ride my bike every so often (usually 2x a week, but it's winter now so i can't), but that really raises my heartbeat and i have to stop and try to slow it down every few MINUTES.
i've also tried a gym, but the machines kick me off because my heart rate goes so high in a short period of time.
i also have leslie sansone's walk away the pounds videos, and i'm planning on using them, but even that is very difficult and i have to work up to it.
i have tried yoga, but with my scoliosis, all i feel in yoga is PAIN. i enjoy weight-lifting, but am no longer in a gym because i wasn't paying for a place
where i can only use 1/10th of the facilities, and i'm pretty sure if i lifted too much weight at once i could really hurt my back badly.


i am mostly interested in low-impact cardio, but idk what kinds of exercises are low-impact enough for someone with a screwed up back and a racing heart.

 

[Korrie]

honestly, I would stick with walking...experts have said it is the best low impact exercise you can do.

 

[Omega]

The brilliant thing about walking is that we can all set our own pace. Even slow walking can be very beneficial... When I was big I didnt walk fast at all - but it was very effective.