Need sentence correction

Before my accident I used to ride a bike a lot, but now I have switched to tennis.

Mister Micawber,

Thank you so much. You know what, I thought about the 'a' and about 'switch', but not about 'but'.

'Switch' is just my suggestion for a more usual verb. The other changes are necessary for natural English. As a pastime, we 'ride a bike', although you could say that you rode on a bike today instead of driving to the supermarket. (But it is still more natural to omit 'on'.)

Thank you very much Mister Micawber.

One more to go. According to this question, option 'b' will be beter, right?

What do they usually do on Sundays?

a) They usually ride on bikes.

b) They usually ride bikes.

Thinking Spaina) They usually ride on bikes.b) They usually ride bikes.

It is also possible to say, 'They usually go riding', but then, how do I know it is 'on bikes' and not 'on horses'?

TS

What do they usually do on Sundays?

a) They usually ride on bikes.

b) They usually ride bikes.

option 'b' will be better, right?-- Right.

'They usually go riding', but then, how do I know it is 'on bikes' and not 'on horses'?-- That's right, so you shouldn't say that unless context makes clear the mode of transportation!

Mister MicawberThat's right, so you shouldn't say that unless context makes clear the mode of transportation!

Then, if the context doesn't make it clear, I should say. 'They go riding bikes'. Is it fine?

TS

Now you've changed the sentence again. English is slippery - you must hold on tightly:

They go bike riding.

Mister Micawber,

Thank YOU so much for all your replies.