Here's a link to a good 16 week fitness programme that works quite well and covers all the areas you need to work on if you're looking to join the army. It claims to be from the official British Army Fitness guide which will apparantly set you back £10.99! You can see the programme for free though so i just copied and pasted it into a word document and saved it to my PC.
Don't forget to warm up and down, and hold stretches on all your major muscle groups for 8-10 seconds before exercise and 20-25 seconds afterwards. I probably don't need to say this, but you must stay committed to it and always put in 100% to see any improvements.
Enjoy
http://www.guardian.co.uk/lifeandstyle/ ... g.fitness1