Hi Rhys, it depends on the activity (they are generally quite physical so some level of fitness usually helps). For canyoning and rock climbing we need to fit a harness. The harnesses fit up to a 59" waist (we have had plenty of happy customers that weigh around 100kg+) which is usually alright for most participants but if you drop us an email with your requirements I'm sure we can help. Kind regards, George
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