Is it ok too exercise whilst treating a fungal infection around inner thigh area, or will this just slow the healing process and make it worse ?

Keep exercising: Exercising will not slow the healing process, and in fact may hasten it. The biggest risk of exercising with a fungal infection is contaminating clothing or equipment, resulting in spreading of the infection on you, or transmission to someone else. Keeping the site covered during your work out can halp prevent this.

It may slow healing: Fungus tends to grow in warm, damp, and dark environments. Exercising should be OK, as long as you keep the area clean and dry, immediately afterwards. It may slow healing process, but the main thing is to keep the area clean and dry regardless of exercise. Also, use your medications as directed by your physician.

Ok: If the exercise causes rubbing, and moisture, a good shower and reapplication of medication will negate the problem. Losing weight from the exercise will help preclude the tendency to pick up the fungus. That said, use your judgement as to what works best for you