• you must work on your flexibility

    That too.

    this, there is limited point in spending money on a fit if you could do some conditioning exercise which will change your flexibility and thus many of the related parameters

    iirc there is a signficant waiting list for a fit with scherrit, in which case use the time beforehand to work on your flexibility. if you joined http://www.sohotbikramyoga.co.uk/ you can get 6 weeks nearly unlimited classes for £135 (£35 for a two week trial, followed by £100 for the subsequent month). If you do 3-4 classes a week you would start to notice some signficant change in your range of movement.

    given the cost of a fit, and the cost of a bike it is a nominal investment of time and money to produce some significant gains

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