exercise,training,lung capacity

Hold breathing heavy bag drills, are excellent cross training aids, mark my words.

I think an easy thing might be just holding your breath while walking during normal daily activities.
Not to the point of blacking out but I think it can put similar demand on your lungs for oxygen to your muscles.

Quote from attan

http://http://www.scubasworld.com/proddetail.php?prod=expandalung&cat=24
i saw this on you tube and scubasworld they say its effective but i dont know.sorry if the link dont open amateur on forum haha but its called expand a lung.its like a snorkel end and honestly i dont know how it works.

Save your $ you'll find this on fee-bay for cheep, try getting in a good workout with your snorkel in your mouth. I run on the beach above the high tide line in the sand holding my breath. Get your muscles
used to living on low O2 levels. Good things take time don't rush it. Dive dive dive every day.
Google o2 tables you can down load them for free.Lay on you back to do them, just don't hurt yourself.
Cheers, Don Paul

Quote from monster slayer

Hold breathing heavy bag drills, are excellent cross training aids, mark my words.

Breath holding heavy bag drills!! hahaha, my bad.

The advantage of cross training boxing/kickboxing- freediving with a heavy bag is two fold. First of all a heavy bag is ready available, and if you have a couple of H.B. gloves and some velcro straps handy, you can do it very often, no need to put some gear on to workout. Second, you can do it as many times as you can in short periods of time, hold your breath while performing middle paced combos 1,2 1,2, 123, 1,1,2, for about 20 secs, breath slowly during ten secs and then a 10 sec sprint until you complete a 3 min round. Do it in sets of 3 rounds and you will be exhaust. Do it at your own pace.

Heavy bag drills alone is the best conditionig excercise, second only to sprints. Kick boxing is even better cause it involves major muscles in the legs as the hamstrings, crural biceps and gluteus.