Curious as to what position you start off with with your clients? I find that they always sort of want you on top first. After putting the condom on they just lay there, so I take that as a hint to go on top? I hate being on top. Most of them don't really like it when you sit down and grind on them, they want you to  literally do squats on their dick for some reason. Then complain that you wasn't on top for long. I don't work out so after about 10-15 reps my thighs are burning and I just want to switch to doggy. My bio says my fave position is doggy(easier for both participants) but honestly I love missionary, not the missionary where they are raised above you and staring into your soul but the missionary where they bury their head in your neck and not staring at you non stop. Most don't do/like that though. 

I love being on top! Often start with that unless they request otherwise, then move to other positions.

I always start on top, too. I weightlift, so I can go for some serious horse jockey session while riding, but that doesn't mean I always feel like it. Not a fan of doggy at work. Spooning and missionary are my favorites when I am feeling lazy.

I start out in cowgirl usually, but when it changes to mish or doggy I get to see what kind of rhythm they actually like and it's often completely different to what I was doing. That's useful info for next time!

I start out in cowgirl usually, but when it changes to mish or doggy I get to see what kind of rhythm they actually like and it's often completely different to what I was doing. That's useful info for next time!

Yes, they usually pound faster when they are in control. Sadly, there is no way I can bounce up and down vigorously. Not sure if that's even possible. 

I can go quite fast but not for very long. also only if they keep totally still if they start thrusting back it just throws off my rhythm haha

When they do that I just stop moving myself til they get bored. Really annoys the crap out of me. XD

I always start on top unless there are real objections. I can't remember the last time that happened. It takes a fair bit of practice to find the technique to finish them quickly, partly because they are not all the same in what they like. But once you get the hang of it, it works well and I always try to finish without changing position. I don't like doggy because I don't feel in control, and IME that's the position they try to play silly tricks.

Usually cowgirl or missionary although I do put the ball in their court so to speak and normally ask "how do you want me" so I go with whatever they prefer. I like missionary the best (the variant where my legs are up on his shoulders) and also doggy, especially to finish as long as they're not too big!