You can use a kitchen timer to keep track of your intervals. If you are unclear what the exercise is I am describing, please look for a video or arrange for an in-person tutorial.
Please consult your doctor before engaging on any fitness regime.
Remember to go for QUALITY over quantity. Breath on the excursion (ie, exhale when pushing yourself up on the push up, inhale as you return to the ground). Keep your abs in as if there is a string from your belly button pulling through to your spine.
1 minute- Walk in place
30 seconds- Jog in place with high knees
1 minute- While standing with feet should-width apart, touch your hand to the opposite toe (or as close as you can without bending the knees). Come back to standing up with arms out to side (180 degree from each other). Alternate and repeat.
1 minute- Push/press ups against a desk, counter, or wall
1 minute- Sumo squats (feet wide apart and toes at 45 degrees) with heel lift. Start with one heel up off ground. Every time you come to bottom of squat change which heel is up. This works your inner thighs.
1 minute- Triceps dip on a stable/sturdy (aka not rolling) chair or bench. Elbows point straight back. Only your arms move you up and down.
1 minute- Split squat by assuming lunge position with right foot in front. Drop left knee almost to ground and stand up again. Feet stay where they are. Keep front knee over the ankle. Repeat.
1 minute- Split squat with left foot in front.
As long as it takes- Leg lifts. 12 reps in each position. Start by laying down on your back. Lift one leg (other leg bent) at a time for lifts- easy. For the next 10 lifts come up to resting on your elbows with a strong back. Then for the last set of twelve, sit straight up and using hands for support, placed slightly behind body with elbows straight. Repeat with other leg.
Repeat as many times as you would like. Get it done!