What are your objectives? Generally speaking I would stay away from an Argos weights set regardless of the aims you have, there will be better equipment available. But, we really need to know what your objectives in "building muscle" are - could you explain please? Personally I am running almost everyday now as my sciatica has relented after 3 years, and I used to run a lot before I injured my back. So I am down to 12.13st on a morning and benching 100kg x3 as max sets which I am very happy with at this weight. Unfortunately I am not deadlifting (at all) or squatting (heavy) as I don't want to place the weight on my lower back. I am doing a lot of reps with 60-80kg squats and mostly work on the leg press. I feel great! Thank fuck sciatica is going.