Try this workout on for size

, It's one I did a while back. This is what the Navy Seals do, I think. This one will really whip you into shape.
First 9 weeks:
Week 1
Running /2 miles/day, 8:30 pace Mon/Wed/Fri
Pushups / 4 sets of 15 pushups Mon/Wed/Fri
Situps /4 sets of 20 situps Mon/Wed/Fri
Pullups/ 3 sets of 3 pullups (chin bar) Mon/Wed/Fri
Swimming/ Swim continuously for 15 min. 4-5 days/week
Week 2
Running / 2 miles/day, 8:30 pace (6 mi/wk) Mon/Wed/Fri
Pushups /5 sets of 20 pushups Mon/Wed/Fri
Situps /5 sets of 20 situps Mon/Wed/Fri
Pullups /3 sets of 3 pullups Mon/Wed/Fri
Swimming /Swim continuously for 15 min. 4-5 days/week
Week 3
Running /No running. High risk of stress fractures Mon/Wed/Fri
Pushups / 5 sets of 25 pushups Mon/Wed/Fri
Situps / 5 sets of 25 situps Mon/Wed/Fri
Pullups / 3 sets of 4 pullups Mon/Wed/Fri
Swimming /Swim continuously for 20 min. 4-5 days/week
Week 4
Running /3 miles/day, 8:30 pace (9 mi/wk) Mon/Wed/Fri
Pushups /5 sets of 25 pushups Mon/Wed/Fri
Situps /5 sets of 25 situps Mon/Wed/Fri
Pullups/ 3 sets of 4 pullups Mon/Wed/Fri
Swimming /Swim continuously for 20 min. 4-5 days/week
Weeks 5-6
Running /2 / 3 / 4 / 2 miles (11 miles/week) Mo/Tu/We/Fr
Pushups /6 sets of 25 pushups Mon/Wed/Fri
Situps /6 sets of 25 situps Mon/Wed/Fri
Pullups /2 sets of 8 pullups Mon/Wed/Fri
Swimming /Swim continuously for 25 min. 4-5 days/week
Weeks 7-8
Running /4 / 4 / 5 / 3 miles (16 miles/week) Mo/Tu/We/Fr
Pushups /6 sets of 30 pushups Mon/Wed/Fri
Situps /6 sets of 30 situps Mon/Wed/Fri
Pullups /2 sets of 10 pullups Mon/Wed/Fri
Swimming /Swim continuously for 30 min. 4-5 days/week
Week 9
Running /4 / 4 / 5 / 3 miles (16 miles/week) Mo/Tu/We/Fr
Pushups /6 sets of 30 pushups Mon/Wed/Fri
Situps /6 sets of 30 situps Mon/Wed/Fri
Pullups /3 sets of 10 pullups Mon/Wed/Fri
Swimming /Swim continuously for 35 min. 4-5 days/week
Second 9 weeks:
Week 1&2
Running /3 / 5 / 4 / 5 / 2 miles (19 mi/wk) Mo/Tu/We/Fr/Sa
Pushups /6 sets of 30 pushups Mon/Wed/Fri
Situps /6 sets of 35 situps Mon/Wed/Fri
Pullups /3 sets of 10 pullups Mon/Wed/Fri
Dips /3 sets of 20 dips Mon/Wed/Fri
Swimming /Swim continuously for 35 min. 4-5 days/week
Weeks 3-4
Running /4 / 5 / 6 / 4 / 3 miles (22 mi/wk) Mo/Tu/We/Fr/Sa
Pushups /10 sets of 20 pushups Mon/Wed/Fri
Situps /10 sets of 25 situps Mon/Wed/Fri
Pullups /4 sets of 10 pullups Mon/Wed/Fri
Dips /10 sets of 15 dips Mon/Wed/Fri
Swimming /Swim continuously for 45 min. 4-5 days/week
Week 5
Running /5 / 5 / 6 / 4 / 4 miles (24 mi/wk) Mo/Tu/We/Fr/Sa
Pushups /15 sets of 20 pushups Mon/Wed/Fri
Situps /15 sets of 25 situps Mon/Wed/Fri
Pullups /4 sets of 12 pullups Mon/Wed/Fri
Dips /15 sets of 15 dips Mon/Wed/Fri
Swimming /Swim continuously for 60 min. 4-5 days/week
Week 6 and beyond
Running /5 / 6 / 6 / 6 / 4 miles (27 mi/wk) Mo/Tu/We/Fr/Sa
Pushups /20 sets of 20 pushups Mon/Wed/Fri
Situps /20 sets of 25 situps Mon/Wed/Fri
Pullups /5 sets of 12 pullups Mon/Wed/Fri
Dips /20 sets of 15 dips Mon/Wed/Fri
Swimming /Swim continuously for 75 min. 4-5 days/week
Note: For weeks 8-9 and beyond, it is not necessary to increase the distance of the runs; work on the speed of your 6 mile runs and try to get them down to 7:30 per mile or lower. If you want to increase the distance of your runs, do it gradually: no more than one mile per day increase for every week beyond week 9.
Note: you can substitute swimming for other things, like intense nunchaku practice.