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Legs from the top down and the bottom up. Lower Body Blast alternates split lunges for the quads, glutes and hamstrings with calf raises for the lower leg, covering the whole chain across thirty days. No equipment, no jumping and barely more floor space than you take up standing still, which makes it one of the easier challenges to run in a bedroom or a hotel room.

Split lunge days are 3 sets with 30 seconds of rest and climb from 16 reps to 30. Calf raise days pair 10 reps with a 10-count hold across 3 sets, non-stop, and never change from day 2 to day 30. All the progression sits on the lunge days, which is deliberate: calves respond to frequency more than to volume, and the non-stop format means those days are already doing real work at a fixed number. Each lunge count appears twice before it rises, so you always get a second attempt at a number before it goes up.

How to do the exercises

Three things run through this challenge: split lunges on one day, then calf raises and a calf raise hold together on the next.

• Split Lunges: step one foot forward into a lunge stance and stay there for the whole set rather than stepping back each time. Lower straight down until both knees are bent at roughly 90 degrees, keeping your front knee above your ankle and your torso upright, then push back up. Both feet stay planted throughout - the only movement is up and down. Reps are counted in total, so 16 split lunges is 8 per leg. Switch legs halfway through the set.
• Calf Raises: stand with your feet hip-width apart and rise onto the balls of your feet as high as you can, then lower back down with control until your heels touch the floor. Full range is what makes this work - half reps in the middle build almost nothing.
• Calf Raise Hold: straight after the 10 reps, rise up and stay at the top for a 10-count with no rest in between. Keep your ankles steady rather than rolling out. Then into the next set with nothing between them.

Adjust Difficulty

Make it easier: On split lunge days, hold the back of a chair or keep a hand on a wall - balance is the limiting factor for a lot of people and steadying yourself does not reduce the strength work. Lower only as far as you can control rather than chasing 90 degrees. On calf raise days, take 30 seconds of rest between the sets rather than running them non-stop, and shorten that rest as the weeks go on. A fingertip on a wall during the holds is fine. Cutting to 2 sets beats missing a day.

Make it harder: On split lunge days, pause for a two-count at the bottom of every rep, or elevate your back foot on a chair or a step to turn these into Bulgarian split squats, which roughly doubles the load on the front leg. On calf raise days, do them with the balls of your feet on the edge of a step so your heels drop below your toes, and extend the hold to a 20-count. Single-leg calf raises are the biggest step up available and are worth saving for the final week.

What to expect

The split lunge days are where the soreness comes from and the first one will tell you which leg is weaker. That asymmetry is normal and narrows over the month. Expect the calf raise days to feel light for the first week and considerably less so once the non-stop format starts stacking - three rounds of ten reps plus a hold with no break is more work than it reads as. Deep calf soreness in the first ten days is expected and settles. What thirty days builds is a lower body that works as one unit: quads and glutes that handle stairs and hills without complaint, and calves and ankles that make walking, standing and pushing off feel considerably easier than they did on day 1.