I would like to know who spe­cial­ises in advising people with hip replace­ments about gym ses­sions and exer­cise. I am wor­ried in case I go some­where where they are not qual­i­fied to give advice for my needs. I need to exer­cise but do not wish to do more harm than good...

I had a total hip replace­ment four months ago. My recov­ery has been great and my con­sult­ant has given me per­mis­sion to start cyc­ling and swim­ming. But it would be more con­veni­ent if for the time being I could use my exer­cise ball to tone up at home. What would you advise?...