I will have 4+ hours in LHR at the end of January, on my way from JFK to Bangalore. I am J in on AA (term 3) and J out to Bangalore on BA (term 4). I am also EXP. I want to be able to workout and to take a shower on my layover. I think the AArrivals lounge in term 3 has treadmills. But I think I would have to clear immigration/customs to get there. Also, my experience is that the BA lounges have more amenities and I would then be over in the right terminal. Any suggestions from the citizens of FT for a good place to get some exercise and a shower would be appreciated!