After a while I learnt to hang on only when I needed to and rested for the rest---around corners is a bludge-over jumps is 'air time'---that is, suck it in. Down the straights it's hold on with one finger and rest the other muscles.
I have been to gyms and tried to get them to do me a program but when they ask which muscles I ues and when-I just tell them " all of them -all the time". It's like a jungle-gym that does 100klm/hr and leaps into the air. They just can't get the gist of it until I show them something on the google whatsit, then they shake their heads and mutter something about 'madness' and shuffle off to leave me to it.
BUT I LOVE IT!!!!(if anyone is listening).
BTW there is a great you tube of Hansi and Fritz in their heyday racing in Switzerland and as Popeye said they are fuul noise up the staright, over the bumps and on full opposite-lock. Fan-bloody-tastic to watch.