I go to a gym, its ok but I do it to tone than try and sgift the earth, Dont have a gym set up at home but do pulls ups in the loft hatch, press ups down the stairs, launch a kettlebell around and shift paving stones around,
If I have my lunch in the yard at work I set myself up with a few barrels, pallets and do somekind of workout/circuit,
Its just a case of looking around and using some initiative.